Stannite Composition, Crystallization and Structure

A sulphide of copper, tin and iron, Cu2S. FeS.SnS2. Zinc at times also present. Tetragonal, sphenoidal, but pseudo-isometric through twinning. Pratically always massive. H. = 4. G. = 4.4. Metallic luster. Color steel-gray. Streak black. Fusible at 1.5. Slightly magnetic after heating in R. F. After roasting, and moistened with hydrochloric acid, gives when inited a blue flame (copper). Fused alone on charcoal gives a novolatile white coating of tin oxide. A rare mineral, found in various places in Cornwall and with the tin ores of Bolivia.

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