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Fluorescent Minerals Collection


SC111 - Uraninite with Schröckingerite from Utah, USA

Locality: Mi Vida Mine, Big Indian Mining District, San Juan Co., Utah, USA (MINDAT)
Size: 4 x 3 x 2 cm

Small Schröckingerite crystal on Uraninite. The uraninite is not fluorescent, but the Schröckingerite has very nice deep green fluorescence.

Very radioactive: 19.3 uS/h (beta+gamma), 145 times the natural background.

Visible light
Shortwave UV

SC121 - Scapolite/Wernerite from Canada

Locality: Canada
Size: 5 x 5 x 3 cm
Weight: 51g

Bright fluorescence under all wavelengths, in particular under longwave UV (365nm) and blue laser (405nm).

Visible light
Longwave UV

SC122 - Wollastonite on Calcite from Sterling Mine, NJ

Locality: Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey, USA (MINDAT)

A bag of small wollastonite on calcite samples.

Visible light
Shortwave UV

SC164 - Corundum var Ruby

Size: 3 x 3 x 1 cm

Corundum/Ruby with unknown inclusions, unknown locality, size ~3cm.

The ruby fluoresce red under both 365nm led UV light and 404nm blue laser, but under 365nm led the inclusions fluoresce a nice bluish white, which is not visible under the 405nm laser.

Visible light
Longwave UV
405nm blue laser

Following, the fluorescence spectra under different excitation wavelengths. The first one shows the Cr3+ strong line. It should be two lines at 693nm and 694nm, but my spectrometer cannot resolve them. The smaller lines before and after the main peak are also due to the Cr. The second spectrum is a scaled down version of the first, showing also lower wavelengths down to 400nm. The flat broad peak between 400nm and 500nm could be the unknown bluish white fluorescent inclusion, but I’m not sure (could be bleeding of the led light). The complex Cr peaks at ~700nm are also more visible in the second image. Third, fourth and fifth spectra are the fluorescence peaks under blue, green and red laser. The strong Cr3+ peak is visible in all of them. Last one is a comparison of all fluorescence spectra.

Ex: 365nm led
Ex: 365nm led
Ex: 405nm blue laser
Ex: 532nm green laser
Ex: 664nm red laser
Comparison

SC166 - Wollastonite and Diopside from Sterling Mine, NJ

Locality: Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey, USA (MINDAT)
Size: 5 x 2.5 x 1 cm
Weight: 20g
minID: QEW-LH3

Wollastonite (white) with diopside (dark green) with (probably) minor calcite. The fluorescence is quite interesting: yellow/orange fluorescence under shortwave UV light, nothing with long wave, and yellow again with a 405nm blue laser. With the laser there is a red flash (typical for calcite); not sure if it is from the wollastonite or some underlying calcite, not really visible otherwise.

Visible light
Shortwave UV
Longwave UV
405nm blue laser

SC176 - Bayleyite from Hideout Mine, Utah, USA

Locality: Hideout Mine, Deer Flat, White Canyon, San Juan Co., Utah, USA (MINDAT)
Size: 5 x 3 x 1 cm
Weight: 4 g
minID: 7J2-KFP

Bright green fluorescent under all wavelengths. Under short wave UV it is has a uniform green/blue color, while under long wave and 405nm laser there is a green/bluish background and some more yellowish “flowers”. I’m not sure which is the bayleyite, probably it is a mixture of secondary uranium minerals.

The fluorescence spectrum shows typical UO2 ions profile. Very similar spectra are obtained under short wave, long wave, and 405nm laser.

It is not too much radioactive: I measure 0.36 uS/h of beta+gamma, just 3 times the background here (but it is very powdery and water soluble (?), so beware!)

Visible light
Shortwave UV
Longwave UV
405nm blue Laser

SC186 - Calcite from Massachusetts, USA

Locality: Lane Quarry, Northfield, Franklin Co., Massachusetts, USA (MINDAT)
Size: 2 x 2 x 1 cm

Visible light
Longwave UV

SC195 - Autunite from Streuberg Quarry, Germany

Locality: Streuberg Quarry, Bergen, Vogtlandkreis, Saxony, Germany (MINDAT)
Size: 0.5 x 0.5 x 0.5 cm

Very bright green fluorescent autunite.

Comparing my fluorescence spectrum with the one on the fluomin webpage, it looks like mine is shifted at longer wavelengths. My spectrum matches more the uranocircite spectrum on fluomin. Streuberg Quarry is the type locality for uranocircite, so maybe this is not autunite after all..

Visible light
Longwave UV

SC231 - Calcite from Citrus Co., Florida, USA

Locality: Citrus Co., Florida, USA (MINDAT)
Size: 4 x 6 x 3 cm
Weight: 66g
minID: K3W-QHQ

Fluorescence and phosphorescent calcite.

Visible light
Longwave UV

SC232 - Calcite from Citrus Co., Florida, USA

Locality: Citrus Co., Florida, USA (MINDAT)
Size: 4 x 4 x 1.5 cm
Weight: 27g
minID: 9FY-DTY

Fluorescence and phosphorescent calcite.

Visible light
Longwave UV

SC233 - Calcite from Kern Co., California, USA

Locality: Kern Co., California, USA (MINDAT)
Size: 4 x 3 x 2 cm
Weight: 18g
minID: 0U1-246

Fluorescence and phosphorescent calcite.

Visible light
Longwave UV

SC235 - Caliche on Sandstone from Utah, USA

Locality: Utah, USA
Size: 8 x 5 x 5 cm
Weight: 118g

A grey caliche crust on white sandstone. Under UV, both fluoresce: the caliche orange, the sandstone light blue. The sandstone is also briefly phosphorescent.

Visible light
Longwave UV

SC236 - Blue fluorescent amber from Sumatra, Indonesia

Locality: Sumatra, Indonesia
Size: 7 pieces
Weight: 53g

Amber pieces from Sumatra, Indonesia. Brown in visible light, strong pastel blue fluorescence under longwave UV light. Always blue but dimmer in under shortwave, with few green speckles. Amber from Indonesia is relatively young for an amber, so it may be better classified as a very old copal.

Visible light
Longwave UV
Visible and longwave UV

SC237 - Polished slab from Sterling Mine, NJ

Locality: Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey, USA (MINDAT)
Size: 9 x 8 x 2 cm
minID: 63G-21N

Polished slab showing calcite (white), zincite (dark red), franklinite (black) and tephroite with exsolution willemite (brown). The calcite fluoresces red under shortwave UV light, and the willemite fluoresces green.

Sterling Mine is (co)type locality for three of the minerals in this piece: Zincite, Franklinite and Tephroite.

Visible light
Shortwave UV

SC238 - Fluorite

Size: 5 x 3 x 3 cm
Weight: 51.5g

Visible light
Visible and longwave UV

SC239 - Calcite

Size: 4 x 2 x 3 cm
Weight: 26.7g

Visible light
Longwave UV

SC242 - Calcite

Size: 1.5 x 1 x 1 cm
Weight: 2.5g

Tiny calcite, very strong phosphorescence.

Visible light
Longwave UV
Phosphorescence

SC252 - Blue Sodalite

Size: 3 x 2.5 x 1 cm
Weight: 13.4g

Tumbled blue sodalite.

Visible light
Longwave UV

SC253 - Fuchsia Agate

Size: 2 x 2 x 1 cm
Weight: 9.4g

Tumbled fuchsia agate, dyed.

Visible light
Longwave UV

SC258 - Yellow fluorescent quartz from La Sassa, Italy

Locality: La Sassa, Montecatini Val di Cecina, Pisa Province, Tuscany, Italy (MINDAT)
Size: 7 x 5 x 5 cm
Weight: 140g
minID: XW4-7QC

Quartz is rarely fluorescent. Quartz from La Sassa in Tuscany, Italy is one of the most notable exceptions.

Visible light
Longwave UV

This sample has also tiny fluorescent crystals (the magenta speckles are artifact from the camera sensor).

Macro in visible light
Macro in longwave UV

SC262 - Nosean on Sanidine from In den Dellen quarries, Germany

Locality: In den Dellen quarries, Mendig, Mayen-Koblenz District, Rhineland-Palatinate, Germany (MINDAT)
Size: 6 x 5 x 4 cm

See on Natures Rainbows

Under long wave the nosean is bright orange, while the sanidine is bluish white. Under short wave there is just a dim red fluorescence. Under normal light the sanidine are white opaque crystals, the nosean “druzy” transparent tiny crystals on top of the sanidine.

Visible light
Longwave UV
Shortwave UV

Two fluorescence spectra were measured: the first from a nosean-rich region, while the second one from a sanidine-only area. The first one shows the typical vibrionic emission of sulphur (S2-) in sodalite group minerals (group of peaks around 650nm), plus two other smaller peaks at about 440nm and 500nm. The second spectrum shows only the two smaller peaks. I think these are from the sanidine, but I do not know much about sanidine fluorescence and its activator(s). From the vibrionic emission, the maximum peak is at 643nm. According to the [ebook written by Ludo Van Goethem and Axel Emmermann](https://www.naturesrainbows.com/copy-of-sodalite-group-minerals), this correspond to the emission of nosean (sodalite peak maximum is at 625nm, nosean at 645nm, haüyne and lazurite at 695nm) The original label said it contained haüyne, not nosean, so the label was probably wrong. Also, photos on Mindat of haüyne from this quarry show light blue crystals, while the druzy in this sample is transparent.

There is another white translucent mineral mixed with the sanidine (not fluorescent), but I don’t know what it is (as far as I know, this could be the sanidine, and the fluorescent one an unknown).

SC264 - Amazonite from Sweden

Locality: Zinkgruvan Mine, Zinkgruvan, Askersund, Örebro County, Sweden (MINDAT)
Size: 3.5 x 3.5 x 2.5 cm

It looks like these samples are grey or only slightly green when they come out from the mine. Sunlight intensifies the green color (and the fluorescence?).

The fluorescence is a bluish green only under shortwave. No fluorescence under longwave.

Visible light
Shortwave UV

SC268 - Calcite from Connecticut, USA

Locality: Connecticut, USA (MINDAT)
Size: 1 x 1 x 2 cm
Weight: 5.2g
minID: EGN-PPL

Visible light
Longwave UV

SC283 - Hourglass Gypsum from Poland

Locality: Chodziez Co., Greater Poland Voivodeship, Poland (MINDAT)
Size: 6.5 x 2 x 1 cm
Weight: 12.4g minID: GFM-DVY

Hourglass gypsum/selenite. While clear in white light, it shows a fluorescent hourglass pattern under UV light. Probably due to selective inclusion of impurities (hydrocarbons?) along crystallographic faces during crystal growth. Major diagonal is 6cm long.

Visible light
Longwave UV

Fluorescence spectrum under 275nm LED. The blue fluorescence color is due to the broad peak between 400nm and 500nm. The sharp and intense peak at 339nm (which looks like to be a doublet) was a surprise. I don't know what is the cause.


SC284 - Aragonite from Vitošov quarry, Czech Republic

Locality: Vitošov quarry, Šumperk District, Olomouc Region, Czech Republic (MINDAT)
Size: 3 x 4 x 2 cm
Weight: 29g
minID: iADG-F0V

“Fluffy” snow white aragonite. Light blue fluorescent under longwave UV light, with a nice green phosphorescence.

Visible light
Fluorescence (LW)
Phosphorescence (LW)

Fluorescence spectrum under 275nm LED. The blue fluorescence color is due to the broad peak centered at about 430nm, possibly due to organic impurities.


SC286 - Fluorite from the Eureka Mine, Kentucky, USA

Locality: Eureka Mine, Marion, Crittenden Co., Kentucky, USA (MINDAT)
Size: 11 x 8 x 4 cm
Weight: 400g

Fluorite crystals with small inclusions of sphalerite. The fluorite has the typical blue fluorescence, but at the base of most crystals there is nice yellow/orange fluorescence of the sphalerite. I’m not sure it is sphalerite, but I think it is the most probable suspect… The yellow fluorescence is quite weak,but clearly visible. If you know better about this locality let me know. The field of view in the macro 1 and 2 is about 2 and 1cm, respectively.

Visible light
Longwave UV
Macro 1 (visible)
Macro 1 (LW)
Macro 2 (visible)
Macro 2 (LW)

SC290 - Yellow fluorescent diamond from South Africa

Locality: South Africa (MINDAT)
Size: 5 x 5 x 3 mm
Weight: 1.2 ct
minID: 4E0-3U6

Little rough diamond. Nice yellow/green fluorescence under longwave UV light, much much weaker under shortwave.

Visible light
Longwave UV

SC291 - Adamite from the Ojuela Mine, Mexico

Locality: Ojuela Mine, Mapimí, Mapimí Municipality, Durango, Mexico (MINDAT)
Size: 6.5 x 4.5 x 2 cm
Weigth: 60g
minID: YAU-4XH

Green fluorescent adamite.

Visible light
Longwave UV

SC292 - Adamite and Calcite from the Ojuela Mine, Mexico

Locality: Ojuela Mine, Mapimí, Mapimí Municipality, Durango, Mexico (MINDAT)
Size: 6 x 4 x 3 cm
Weigth: 77g
minID: NNV-T7Q

The adamite is greenish under normal light and fluoresces bright green. The calcite is white and fluoresces bluish white.

Visible light - side 1
Longwave UV - side 1
Visible light - side 2
Longwave UV - side 2

SC293 - Esperite from Franklin Mine, NJ

Locality: Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA (MINDAT)
Size: 12 x 9 x 5 cm
minID: 9C2-47R

Esperite (FL yellow), calcite (FL red), hardystonite (FL blue) and a little willemite (FL green) from the esperite type locality. A very nice sample of four colors fluorescent rock.

The bright blue spot visible under long wave UV is most likely glue from an old label

Visible light
Shortwave UV
Longwave UV

The fluorescence emission spectra of esperite shows the strong 546 peak of Mn++ replacing Zn++ (other peaks are mercury from the lamp).


SC294 - Calcozincite from the Sterling Hill Mine, New Jersey, USA

Locality: Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey, USA (MINDAT)
Size: 12 x 9 x 3 cm
Weight: 550 g
minID: 0P3-RJ0

Calcozincite (orange) surrounded by calcite (white) with black dots of franklinite. The calcite fluoresces a bright red under shortwave UV light. The calcozincite (a mix of calcite, zincite and tremolite fibers) fluoresces a weaker zoned pink/white. The back size is covered by calcite and franklinite with a little willemite, which fluorescences bright green.

Visible light
Shortwave UV
Shortwave UV (filter)
Visible light
Shortwave UV

SC295 - Willemite from the Franklin Mine, New Jersey, USA

Locality: Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA (MINDAT)
Size: 8 x 4 x 4 cm
Weight: 145g
minID: 1E7-XQC

Green fluorescent willemite with black franklinite and red zincite.

The fluorescence is extremely intense. It is also “daylight fluorescent”: if outside in a sunny day in the shadow the UV light from the sun is enough to make the sample more green than under artificial light.

Visible light
Shortwave UV

SC296 - Willemite and Hardystonite from the Franklin Mine, New Jersey, USA

Locality: Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA (MINDAT)
Size: 11 x 8 x 4 cm
minID: QR9-L10

Green fluorescent willemite with a vein of blue fluorescent hardystonite.

Visible light
Shortwave UV

SC297 - Willemite from the Sterling Hill Mine, New Jersey, USA

Locality: Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey, USA (MINDAT)
Size: 12 x 9 x 2 cm
minID: CJJ-VGJ

Green fluorescent willemite with a little red fluorescent calcite.

Visible light
Shortwave UV

SC298 - Willemite from the Franklin Mine, New Jersey, USA

Locality: Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA (MINDAT)
Size: 6 x 6 x 4 cm
minID: G4C-8A7

Green fluorescent willemite with black franklinite.

Visible light
Shortwave UV

SC299 - Clinohedrite, Hardystonite, Willemite from the Franklin Mine, New Jersey, USA

Locality: Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA (MINDAT)
Size: 8 x 5 x 4 cm
minID: WUF-JW3

Clinohedrite (orange) with Hardystonite (blue) and willemite (green). Also, non fluorescent Diopside var Shafferite (platy brown).

Visible light
Shortwave UV
Diopside var Shafferite

SC300 - Agrellite from Kipawa, Quebec, Canada

Locality: Kipawa alkaline complex, Les Lacs-du-Témiscamingue, Témiscamingue RCM, Abitibi-Témiscamingue, Québec, Canada (MINDAT)
Size: 12 x 5 x 2 cm
minID: A26-9F4

Pink fluorescent agrellite from the type locality. White in normal light, fluoresces pink under shortwave or middlewave, more orange under longwave, and redder under blue laser. The orange/red fluorescence is due to manganese (broad band centered at ~580nm) and a mix or rare earth elements (REE), like dysprosium and samarium.

Visible light
Shortwave UV
Longwave UV

The fluorescence spectra from shortwave, longwave, and blue laser show that the main peaks are almost the same, but the relative intensities change, causing the shift in color.


SC301 - Tremolite, Anthophyllite and Clino-Suenoite from Talcville, NY

Locality: International Talc Company Mine, Talcville, St. Lawrence Co., New York, USA (MINDAT)
Size: 10 x 6 x 2 cm
Weight: 145 g
minID: 7H1-1UY

See on Nature’s Rainbow

Tremolite mixed with anthopyllite and/or clino-suenoite. Under long wave UV light the tremolite fluoresces yellow/orange while the antophyllite/clino-suenoite fluoresces red/violet. Under shortwave UV light or 405nm laser the red/violet essentially disappears and the whole specimen fluoresces yellow/orange. Clino-suenoite changed name quite often (tirodite, manganocummingtonite, …); see UV Waves v50, n3 (2020). As far as I know it is not possible to distinguish the anthopyllite from the clino-suenoite without elemental analysis. Let’s call the red fluorescent mineral(s) “red amphibole” (as the UV Waves article suggested).

Front visible light
Front longwave UV
Back visible light
Back longwave UV

Four spectra were acquired: two for the tremolite and two for the red amphibole, under 365nm LED and 405nm blue laser. Both tremolite spectra have the same peak at about about 580nm. This should be due to Mn2+ substituting Ca2+. The spectrum of the red amphibole under 365nm led shows a peak at about 650nm (Mn2+ substituting Mg2+ ?), with a shoulder at about 580nm. With the 405nm blue laser the spectrum of the red amphibole shows two clear peaks: one at 580nm and one at 650nm.

My guess is that the red amphibole spectrum is a mix of the emission of the two minerals: tremolite emitting at 580nm and the red amphibole at 650nm. The red amphibole fluoresces weaker under shortwave UV light or 405nm blue laser, leaving only the tremolite visible. The intensities in the spectra are normalized and cannot be compared. The sharp peak 535nm is leaking (?) from the blue laser.

SC302 - Fluorite cubes with Cerussite from New Mexico, USA

Locality: Blanchard Mine, Bingham, Socorro Co., New Mexico, USA (MINDAT)
Size: 12 x 10 x 7 cm
minID: DQU-66A

See on Nature’s Rainbow

White fluorite cubes covered by secondary lead minerals, mostly (?) cerussite. The cerussite is powdery white, but it covers a translucent mineral which is not (or weakly so) fluorescent. Biggest fluorite cubes are between 8 and 10 mm in size. In the matrix there are some shiny galena cubes, only partially visible.

Visible light
Longwave UV

The fluorescence spectra are typical Europium (Eu2+) activated fluorite and for ceruissite.


SC303 - Chalcedony from New Mexico, USA

Locality: Mule Creek, Steeple Rock Mining District, Grant Co., New Mexico, USA (MINDAT)
Size: 5 x 4 x 3 cm
Weight: 57g
minID: 501-AK1

Visible light
Longwave UV

SC304 - Septarian from New Mexico, USA

Locality: Nacimiento Mine, San Pablo, Sandoval Co., New Mexico, USA (MINDAT)
Size: 5 x 3.5 x 2 cm
Weight: 50g
minID: 8JT-PDP

Visible light
Longwave UV

SC305 - Fluorite from New Mexico, USA

Locality: Small Fry prospect, El Rito, El Rito District, Rio Arriba Co., New Mexico, USA (MINDAT)
Size: 4.5 x 4.5 x 1 cm
Weight: 23g
minID: TUP-DT8

Visible light
Longwave UV

SC307 - Petroleum Quartz from Balochistan, Pakistan

Locality: Balochistan Region, Pakistan (MINDAT)
Size: 2 x 1 x 1 cm
Weight: 2.7 g
minID: 3GM-QHL

A nice little quartz crystal, doubly terminated, with lots of yellow oil inclusions. Most are small and “solid”, one is larger, and contains a moving bubble (of what?). Under longwave UV light, the solid inclusions fluoresce a very bright blue, while the larger one has a more yellowish tint (in the photo it is the white/oversaturated blob). Unfortunately I couldn’t capture the difference in the photo…

Visible light
Longwave UV

The fluorescence spectrum shows a lot of superimposed peaks in the blue region (400-500nm), with the maximum of emission in the green region (500-550nm).


SC308 - Benitoite from California State Gem Mine, California

Locality: California State Gem Mine, San Benito Co., California, USA (MINDAT)
Size: 8 x 6 x 5 cm
minID: 9YQ-1YM

Super blue fluorescence! There are a few tiny crystals; the biggest about 3mm.

Visible light
Shortwave UV
Macro visible light
Macro Shortwave UV
Macro visible light
Macro Shortwave UV

The fluorescence spectra from 275nm led show a broad peak centered at about 406nm. The blue fluorescence should be due to TiO6 groups.


SC311 - Zircon from Malawi

Locality: Malawi (MINDAT)
Size: 6 x 5 x 5 cm
minID: 2LA-KJT

“Elephant” zircon from Malawi. The crystal is huge! Best fluorescence under shortwave UV light.

Visible light
Shortwave UV

Broad band centered at 580nm. Fluorescence under 275nm LED light.


SC312 - Yooper Sodalite from Milwaukee Co., Wisconsin, USA

Locality: Milwaukee Co., Wisconsin, USA (MINDAT)
Size: 4 x 3 x 3 cm
Weight: 64.5 g
minID: MM0-9QU

Sodalite in Syenite, also called with the trademarked name Yooperlite. This is not from the yooperlite “type locality” (Upper Peninsula in Michigan, Lake Superior), but from the nearby Milwaukee County on Lake Michigan. It was collected in northern Milwaukee county along the beach at night. The exact location is not known, but it may have been north of the Schlitz Audubon nature center.

Visible light
Longwave UV

Fluorescent spectrum under 365nm LED. Typical for sodalite.


SC313 - Chalcedony from Milwaukee Co., Wisconsin, USA

Locality: Milwaukee Co., Wisconsin, USA (MINDAT)
Size: 5 x 4 x 4 cm
Weight: 94 g
minID: N1U-HQ7

This was collected in northern Milwaukee county along the beach at night. The exact location is not known but it may have been north of the Schlitz Audubon nature center. I’ve been told these chalcedony nodules are fairly common and have varying degrees of fluorescence, most are a dull yellow tan to a dull orange in color and some show no fluorescence. The element/mineral that causes the fluorescence is not known, but it could be carbonate. On the lake Michigan beaches you can find chalcedony after carbonate pseudomorph of Favosites and Halysites corals and, though this one is not an obvious former fossil, it does have some interesting patterns/structure that make it a possibility.

Visible light
Longwave UV

The fluorescent spectrum under 365nm LED shows a broad, composite band centered at about 570nm. Not sure about the activator... Probably carbonates and organic compounds.


SC314 - Tugtupite and Polylithionite from Taseq Slope, Greenland

Locality: Taseq Slope, Ilímaussaq complex, Narsaq, Kujalleq, Greenland (MINDAT)
Size: 4 x 2 x 2 cm
Weight: 22g
minID: JUK-GYC

The “matrix” is mostly tugtupite (tenebrescent pink) and fluorescent red and orange under shortwave and longwave UV light, respectively. Phosphorescent white under both shortwave and longwave. The top left in the first side is polylithionite, fluorescent yellow/green under shortwave, nothing under longwave. Between the polylithionite and the tugtupite there is a little unknown, fluorescent white/blue(?) mostly under longwave and phosphorescent whitish. The second side is again mostly tugtupite. The bottom right corner is blue/grey, tenebrescent dark red, not much fluorescent under shortwave, and strong orange under longwave. No phosphorescence. I guess it is blue sodalite? The crystal on top of the sodalite is not fluorescent. Don’t know what it is. On the back of the sodalite there is something fluorescing white/blue under shortwave (no photo). The label says there is tugtupite, chkalovite, albite, polylithionite, neptunite, pyrochlore, aegirine, sodalite.

Visible light
Shortwave UV
Longwave UV
Visible light
Shortwave UV
Longwave UV

SC315 - Diopside from Lake Valhalla Quarry, New Jersey, USA

Locality: Lake Valhalla Quarry, Montville Township, Morris Co., New Jersey, USA (MINDAT)
Size: 11 x 7 x 7 cm
minID: PP4-KPL

Big chunk of diopside. Nice blue fluorescence under shortwave UV light. Under longwave UV light the color is more yellowish, and even more with a 405nm blue laser. It looks like there is an orange/red flash phosphorescence.

Visible light
Shortwave UV

I collected three fluorescence spectra under 275nm LED, 365nm LED and 405nm blue laser. The first and second ones show a broad peak at about 435/440 nm. This should be due to nTiO6 groups. It looks like the spectrum under 365nm led is composite with more hidden peaks at about 470nm, 500nm and 580nm. The spectrum under 405nm blue laser is very different. The main peak is now at 580nm, due to Mn2+ replacing Ca2+ and there is a broad peak at about 490nm. I don't know what is the activator for this second peak. (The sharp peak at 536nm is leaking from the blue laser).


SC316 - Celestine from La Grasta Mine, Italy

Locality: La Grasta Mine, Caltanissetta, Sicily, Italy (MINDAT)
Size: 6 x 4 x 2 cm
Weight: 72g
minID: 901-94Q

Fluorescent blue/white under any wavelength, with greenish phosphorescence. Fluorescence should be due to organic impurities.

Visible light
Longwave UV

The main fluorescence peak is barely in the visible range at 400nm (peak at 540nm is probably an artifact).


SC317 - Celestine from La Grasta Mine, Italy

Locality: La Grasta Mine, Caltanissetta, Sicily, Italy (MINDAT)
Size: 5.5 x 2.5 x 2.5 cm
Weight: 49g
minID: 0C2-XEY

Fluorescent blue/white under any wavelength, with greenish phosphorescence. Fluorescence should be due to organic impurities.

Visible light
Longwave UV

SC318 - Celestine from La Grasta Mine, Italy

Locality: La Grasta Mine, Caltanissetta, Sicily, Italy (MINDAT)

Multiple fragments of celestine. Fluorescent blue/white under any wavelength, with greenish phosphorescence. Fluorescence should be due to organic impurities.

Visible light
Longwave UV

SC319 - Dumortierite from Vaca Morta quarry, Brazil

Locality: Vaca Morta quarry, Serra da Vereda, Boquira, Bahia, Brazil (MINDAT)
Size: 1.5 x 0.5 x 0.5 cm
Weight: 1.6 g
minID: R95-33U

Dumortierite (blue) on both sides of a quartz matrix. The dumortierite fluoresces a nice blue under shortwave UV light. A very small piece…

Visible light
Shortwave UV

SC320 - Dumortierite from Vaca Morta quarry, Brazil

Locality: Vaca Morta quarry, Serra da Vereda, Boquira, Bahia, Brazil (MINDAT)
Size: 5.5 x 3 x 2 cm
Weight: 51.5 g
minID: GM6-QE2

Dumortierite (blue) on both sides of a quartz matrix. The dumortierite fluoresces a nice blue under shortwave UV light. Inside the quartz matrix there is an unknown mineral: opaque white under normal light, bright white fluorescence under longwave UV light (no reaction under shortwave light). No idea what it is. It looks like there are more of these white fluorescent pieces inside the quartz.

Visible light
Shortwave UV
Visible light
Shortwave UV
Longwave UV

The fluorescence spectrum of the dumortierite (excitation 275nm led) shows a nice peak at about 390nm, at a shorter wavelength than expected (460nm, Gorobets & Rogojine 2002). The spectrum of the unknown mineral (excitation 365nm led) shows a broad composite peak between 450nm and 550nm.


SC323 - Tenebrescent Sodalite from Tunulliarfik Fjord, Ilímaussaq, Greenland

Locality: Tunulliarfik Fjord, Ilímaussaq complex, Narsaq, Kujalleq, Greenland (MINDAT)
Size: 9 x 3 x 4 cm
Weight: 131 g
minID: T0J-R4N

Strongly tenebrescent sodalite (var hackmanite). The sodalite becomes a deep purple color after irradiation with longwave and, more strongly, shortwave UV light. Exposure to white light clears the purple color, and the sodalite returns clear (white).

Visible light
Tenebrescence
Longwave UV
Shortwave UV

SC324 - Sørensenite from Kvanefjeld, Greenland

Locality: Kvanefjeld, Ilímaussaq complex, Narsaq, Kujalleq, Greenland (MINDAT)
Size: 3.5 x 3 x 2 cm
Weight: 15.4 g
minID: 1X3-EU6

A silicate containing tin and beryllium. Quite rare and only found in Greenland. Nice grey/white fluorescence under both shortwave and longwave UV light. Longwave (365nm LED) photo is with a 420nm yellow filter: there is a lot of blue, which I don’t understand if it is reflection of the UV light or fluorescence. Under longwave part of the sorensenite fluoresces a more yellow/orange color.

Visible light
Shortwave UV
Longwave UV

The fluorescence spectra are quite interesting. With a shortwave 275nm LED excitation there is a broad fluorescence peak at about 440nm with a second peak at about 405nm (543nm is an artifact). With a longwave 365nm LED the spectrum is much more complex with multiple peaks at 440nm, 485nm, 505nm, and 580nm. I don't know the activator(s): TiO6 groups are reported in the literature, and could be the cause of the 440nm broad peak.


SC325 - Raspberry Garnet from Sierra de Cruces, Mexico

Locality: Sierra de Cruces, Sierra Mojada Municipality, Coahuila, Mexico (MINDAT)
Size: 2.5 x 2 x 2 cm
Weight: 14.4 g
minID: L70-47Q

See on Nature’s Rainbow

Raspberry garnet var grossular, also called Rosolite. The main crystal is about 10mm in size. Nice orange fluorescence under long wave UV light, best under 405nm blue laser (but you need a filter to block the blue light).

Visible light
405nm blue laser
Longwave UV

The fluorescence spectra from a 405nm blue laser shows a broad peak centered at about 610nm due to Mn2+ substituting Ca2+ (the spike at 536nm is from the blue laser).


SC328 - Calcite & Fluorite from Fujian, China

Locality: Fujian, China (MINDAT)
Size: 6 x 7 x 5 cm
Weight: 190g
minID: APH-2R4

Hexagonal or columnar calcite crystals with a little of fluorite.

Visible light
Longwave UV

SC330 - Tugtupite and Sorensenite from Kvanefjeld, Greenland

Locality: Kvanefjeld, Ilímaussaq complex, Narsaq, Kujalleq, Greenland (MINDAT)
Size: 5 x 3 x 3 cm
Weight: 61g
minID: WRT-6LY

The rare mineral sorensenite associated with tugtupite. Best is under shortwave UV light: the sorensenite fluoresces a nice white, while the tugtupite fluoresces bright red. Under longwave UV light there is a lot of orange fluorescence from the tugtupite (and possibly sodalite in the matrix?). The tugtupite is also slightly tenebrescent: it saturates to a slight pink color under exposure to UV light (will bleach to white under artificial white light).

Visible light
Shortwave UV
Longwave UV

SC331 - Carpathite from Picacho Mine, California, USA

Locality: Picacho Mine, Picacho Peak, New Idria Mining District, San Benito Co., California, USA (MINDAT)
Size: 7 x 5 x 3 cm
Weight: 97g
minID: UTQ-VMM

Visible light
Longwave UV

Last update: 10 October 2020