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SC361 - Hyalite on Basalt

Locality: Gallatin Co., Montana, USA (MINDAT)
Size: 7 x 5 x 4 cm - Small cabinet (5-7 cm)
Weight: 85 g
minID: D38-GAA

Green fluorescent hyalite on basalt matrix. The best fluorescence is under shortwave UV light, weaker under longwave. I have been told it was collected in the summer of 2019 or 2020, from a locality close to the Hyalite Canyon, near Bozeman in Gallatin County, Montana. The exact locality is currently being kept confidential.

Photo in normal light.
Fluorescence under shortwave UV light (254nm Hg light).
Fluorescence spectra under UVA and UVC. Typical for uranyl activation. Not sure about the peak at ~850nm (could be an artifact).
Last update: 18 March 2021