Colemanite

145 x 111 x 77 mm overall

This two-sided Colemanite specimen is from the old Corkscrew Mine located inside Death Valley National Monument. It is comprised of intergrown, glassy, colorless, spheroidal aggregates of Colemanite crystals, some with minor clay inclusions. Single crystals to 4 mm are also present. Trivial damage is present along the two of the margins where it was removed, otherwise in excellent condition. This was found in the 1980s, and collecting here is now forbidden. Fluorescent yellow in both SW and LW Ultraviolet light.