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.
Fluorescence under shortwave UV light.
Normal light.
Fluorescence spectra under UVC (275nm) LED light. Typical emission of the uranyl UO22+ ion.
