SC335 - Tremolite, Graphite

Locality: Franklin Quarry (Braens Quarry; Moses Bigelow Quarry; Farber Quarry), Franklin Marble, Franklin, Franklin Mining District, Sussex County, New Jersey, USA (MINDAT)
Size: 6 x 6 x 5 cm - Small cabinet (5-7 cm)
Weight: 192 g
minID: UKW-W66

Tremolite in Franklin Marble, with graphite flakes and little pyrite. The tremolite, grey in daylight, fluoresces bluish/greenish under shortwave UV light. The marble has a deep blue/violet fluorescence, very similar to UV light reflection. The fluorescence spectrum of the marble shows a peak centered at about 350nm, which could be due to Ce³⁺.

Fluorescence under shortwave UV light (254nm Hg light).

Fluorescence spectrum of the marble under 275nm UVC LED. The peak at about 350nm could be due to Ce³⁺ (544nm is an artifact).

Last update: 28 December 2020