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STANNITE

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Originally appearing in Volume V25, Page 782 of the 1911 Encyclopedia Britannica.
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STANNITE , a rare See also:

mineral consisting of See also:tin, See also:copper and See also:iron sulphide (a sulpho-stannate, Cu2FeSnS4), containing, when pure, tin 27.5, copper 29.5%. It has a metallic lustre, and, when pure, is iron-See also:black in See also:colour: more often, however, it is See also:bronze-yellow, owing to tarnish or to the presence of intimately ad-mixed chalcopyrite: for this See also:reason it is known to miners as " See also:bell-See also:metal-ore " or as " tin See also:pyrites." The hardness is 32 and the specific gravity 4.45. It usually occurs as granular to compact masses, rarely as crystals. See also:Minute crystals from See also:Bolivia have been shown to be tetragonal and hemihedral, like chalcopyrite; and to be invariably twinned, giving rise to pseudocubic forms. The mineral has been found in a number of Cornish tin mines, and was formerly worked to a limited extent as an ore. At Zinnlvald in Bohemia it occurs with See also:blende and See also:galena, and in Bolivia with See also:silver ores. (L. J.

End of Article: STANNITE

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