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Elmwood sphalerite on calcite from the Smith County mine in the United States (1998).
Stone dimensions: L: 150mm x W: 90mm x H : 100mm.
Weight: 1070g.
Chemical composition of sphalerite: zinc sulphide, ZnS.
Hardness: 3.5 - 4 on the Mohs scale. Density 3.9 to 4.2.
