Learn about Cassiterite
mirror-like luster and dense, prismatic crystals; localities Panasqueira, Xuebaoding, Viloco; value hinges on finish, size, and matrix.Llallagua
Llallagua, Bolivia — a premier tin locality in the Andes, yielding jet-black cassiterite, quartz, rare sulfosalts, and a phosphate suite prized by collectors.
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