fluorescent CALCITE, FLUORITE with SPHALERITE - Cave-In-Rock, Illinois, USA
Light orange Calcite crystals - fluorescent in shades of orange SW and LW, pale-yellow Calcite - fluorescent in cream SW, blue-yellow-purple colored Fluorite fluorescent blue LW, and brown Sphalerite.
from Cave-In-Rock (Minerva No. 1 Mine), Cave-in-Rock Sub-District, Illinois - Kentucky Fluorspar District, Hardin County, Illinois, USA
Measures approximately 3 x 2 x 1.5 inch, 5.92 oz / 76 x 51 x 38 mm, 168g
Item # A1350314
To show the fluorescent response the specimen was illuminated using 6 watt 254nm (Short Wave) / 366nm (Long Wave) UVGL-58 lamp (you need a proper UV light source to observe the fluorescence, more powerful lamp = brighter response).