Same specimen as in photo GST3a, here viewed under a blue LED light source with peak emission at about 445 nm. The photograph was taken through a yellow barrier filter fitted to the camera to absorb the blue light and show the true colors of fluorescence. In this view, the gerstmannite fluoresces olive green, the calcite reddish-orange, the sphalerite orange, and the willemite bright yellowish-green. This photograph dates from the first observation of fluorescence in gerstmannite; see Mazel and Verbeek (2014) for details.
Identifier: GST3b Locality: 1120 stope above 1100 level, Sterling mine, Ogdensburg Specimen size: 9.5 x 5.5 x 3.5 cm Photo credit: Charles Mazel (Nightsea, Lexington, MA)
