Faceted Zinc Sphalerite, White ZnS Gemstones Stone:Round (Crackled), 6mm, avg. 0.9ct but it is never available

but it is never available in large sizes

Even broken it is an incredible gem of science

and occasional blue

a crystal grown for its insanely strong fluorescence

Faceted Zinc Sphalerite, White ZnS Gemstones Stone:Round (Crackled), 6mm, avg. 0.9ct but it is never availableThese are faceted labmade Zinc Sphalerite (ZnS). While facet grade sphalerite is only rarely found in nature (and usually has a dark red or orange color), and is very difficult to cut, if you're brave enough to cut it, the resulting stones have incredible fire and dispersion. Colorless ZnS is grown for use for optics, and various doped versions are used as phosphors if you have an old oscilloscope, the iconic blue or green display panel likely used