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PROUSTITE

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Originally appearing in Volume V22, Page 490 of the 1911 Encyclopedia Britannica.
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PROUSTITE , a See also:

mineral consisting of See also:silver sulpharsenite, AgaAsS3, known also as See also:light red silver ore, and an important source of the See also:metal. It is closely allied to the corresponding sulphantimonite, See also:pyrargyrite, from which it was distinguished by the chemical analyses of J. L. See also: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 See also:species. The prismatic crystals are often terminated by the scalenohedron 12011 and the obtuse rhombohedron { to}, thus resembling See also:calcite (See also:dog-tooth-spar) in See also:habit. The See also:colour is See also:scarlet-See also:vermilion and the lustre adamantine; crystals are trans-See also:parent and very brilliant, hut on exposure to light they soon become dull See also: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 See also:groups of large crystals have been found at Chafiarcillo in See also:Chile; other localities which have yielded See also:fine specimens are See also:Freiberg and See also:Marienberg in See also:Saxony, Joachimsthal in Bohemia and See also:Markirch in See also:Alsace. (L. J.

End of Article: PROUSTITE

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PROUT, SAMUEL (1783–1852)

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