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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+.

Photo in normal light.
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