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Encyclopedia Britannica



STANNITE

This article appears in Volume V25, Page 782 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: SOU-STE
STANNITE , a rare
mineral
  consisting of tin, copper and
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
 -
black
  in colour: more often, however, it is bronze-yellow, owing to tarnish or to the presence of intimately ad-mixed chalcopyrite: for this reason it is known to miners as "
bell
 -metal-ore " or as " tin pyrites." The hardness is 32 and the specific gravity 4.45. It usually occurs as granular to compact masses, rarely as crystals.
Minute
  crystals from
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
blende
  and galena, and in
Bolivia
  with silver ores. (L. J. S.)


End of Article: STANNITE


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