Faceted Zinc Sphalerite, White ZnS Gemstones Stone:Round, 10mm, avg. 5ct Some are end cuts that

Some are end cuts that show crystal faces while others have been sawn into flat plates in the process of making wafers for scientific use

There is a very small chip on one end which also has beveled facets

Its only real downside is its hardness of 5 and brittleness

but growing a large single crystal is so difficult that some scientists told us it was outright impossible

blue laser Yb:YAG

Faceted Zinc Sphalerite, White ZnS Gemstones Stone:Round, 10mm, avg. 5ct Some are end cuts thatThese 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