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Encyclopedia Britannica



PROUSTITE

This article appears in Volume V22, Page 490 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: PRE-PYR
PROUSTITE , a
mineral
  consisting of silver sulpharsenite, AgaAsS3, known also as
light
  red silver ore, and an important source of the metal. It is closely allied to the corresponding sulphantimonite, pyrargyrite, from which it was distinguished by the chemical analyses of J. L.
Proust
  in 1804, after whom the
mineral
  received its name. Many of the characters being so similar to those of pyrargyrite (q.v.) they are mentioned under that species. The prismatic crystals are often terminated by the scalenohedron 12011 and the obtuse rhombohedron { to}, thus resembling
calcite
  (dog-tooth-spar) in habit. The colour is
scarlet
 -
vermilion
  and the lustre adamantine; crystals are trans-
parent
  and very brilliant, hut on exposure to
light
  they soon become dull black and opaque. The streak is
scarlet
 , the hardness 22, and the specific gravity 5'57. The mode of occurrence is the same as that of pyrargyrite, and the two minerals are sometimes found together. Magnificent groups of large crystals have been found at Chafiarcillo in Chile; other localities which have yielded fine specimens are Freiberg and Marienberg in
Saxony
 , Joachimsthal in Bohemia and
Markirch
  in
Alsace
 . (L. J. S.)


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