ZnS and CaCO₃ - Mohs Hardness: 3½ - 4 and 3. Crystals of suitable size and transparency have been fashioned into gemstones, usually featuring the brilliant cut to best display the stone's high optical dispersion. Freshly cut gems have a lively, adamantine luster and could be mistaken for fancy-colored diamonds, but given sphalerite's softness and fragility, the gems are best left unset as collector's items or museum pieces.
UT Department of Environmental Sciences
The University of Toledo
Digital Initiatives, University of Toledo Libraries
environmental sciences; virtual exhibitions
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