Sphalerite gem

Sphalerite is a zinc sulfide mineral found not only throughout the Earth but also in lunar rocks and meteorites. It is the leading zinc mineral, but it is also a source of cadmium, germanium, gallium, and indium. The yellow, red, orange, and green crystal forms are valued in the gemstone market for their brilliant light-dispersion properties, although the stone is too soft for most jewelry.

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