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SC445 - Sphalerite

Locality: Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA (MINDAT)
Size: 12 x 9 x 5 cm - Large cabinet (10-15 cm)
Weight: 470 g
minID: 8NT-QA6

Sphalerite and calcite on dark brown matrix. Under longwave UV light the sphalerite shows a zoned orange and violet fluorescence and marked violet phosphorescence/afterglow. The calcite fluoresces the typical red under shortwave UV light.

Left: Fluorescence under 254nm UVC (shortwave) Hg light. Right: normal light.
Left: Fluorescence under 365nm UVA (longwave) LED. Right: normal light.
Left: Phosphorescence/Afterglow after exposure to 365nm UVA (longwave) LED. Right: normal light.
Last update: 18 October 2021