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Encyclopedia Britannica



STEPHANITE

This article appears in Volume V25, Page 880 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: SOU-STE
STEPHANITE , a
mineral
  consisting of silver sulphantimonite, AgsSbS4; containing 68.s % of silver, and sometimes of importance as an ore of this metal. Under the name Schwarzerz it was mentioned by G. Agricola in 1546, and it has been variously known as "black silver ore" (Ger. Schwarzgultigerz), brittle silver-ore (Sprodglanzerz), &c. The name stephanite was proposed by W.
Haidinger
  in 1845 in honour of the archduke Stephan of
Austria
 ;
French
  authors use F. S.
Beudant
 's name psalurose (from the
Greek
  i1saOvp6s, fragile). It frequently occurs as well-formed crystals, which are orthorhombic and occasionally show indications of hemimorphism: they have the form of six-sided prisms or flat tables terminated by large basal planes and often modified at the edges by numerous pyramid-planes. Twinning on the prism-planes is of frequent occurrence, giving rise to pseudo-hexagonal groups like those of aragonite. The colour is
iron
 -black, and the lustre metallic and brilliant; on exposure to light, however, the crystals soon become dull. The
mineral
  has a hardness of 21 and is very brittle; the specific gravity is 6.3. Stephanite occurs with other ores of silver in metalliferous veins. Localities which have yielded good crystallized specimens are Freiberg and Gersdorf near Rosswein in
Saxony
 , Chanarcillo in Chile, and exceptionally
Cornwall
 . In the Comstock lode in Nevada massive stephanite and
argentite
  are important ores of silver.
(L. J. S.)


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