Stannite
Yaogangxian Mine, Yaogangxian W-Sn ore field, Yizhang Co., Chenzhou, Hunan, China
Stannite is a rare copper, iron, zinc, tin sulfide, with hard to find, well-crystallized specimens generally found only at the Yaogangxian Mine or in Bolivia. Crystals of this size are very rare, almost never seen from either locale. The intergrown crystals have a good, metallic luster, and the steel-grey color has just a hint of brassy-yellow ...
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