Faceted Zinc Sphalerite, White ZnS Gemstones Stone:Round, 10mm, avg. 5ct this is common for hydrothermal

this is common for hydrothermal growth

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These stones have some fractures and inclusions like a natural beryl would

Like normal Cr YAG (aka Christmas Garnet) it has a super rich green base color

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

Faceted Zinc Sphalerite, White ZnS Gemstones Stone:Round, 10mm, avg. 5ct this is common for hydrothermalThese 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