Proustite

Proustite

Proustite is a sulfosalt mineral consisting of silver sulfarsenide, Ag3AsS3, known also as light red silver or ruby silver ore, and an important source of the metal. It is closely allied to the corresponding sulfantimonide, 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 they are mentioned under that species. The prismatic crystals are often terminated by the scalenohedron and the obtuse rhombohedron, thus resembling calcite (dog-tooth-spar) in habit. The color is scarlet-vermilion and the lustre adamantine; crystals are transparent and very brilliant, but on exposure to light they soon become dull black and opaque. The streak is scarlet, the hardness 2.5, 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 Chañarcillo in Chile; other localities which have yielded fine specimens are Freiberg and Marienberg in Saxony, Joachimsthal in Bohemia and Markirch in Alsace.

ee also

*List of minerals
*List of minerals named after people


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Look at other dictionaries:

  • Proustite — Catégorie II : sulfures et sulfosels[1] Région de Freiberg, Monts Métallifères, Saxe …   Wikipédia en Français

  • Proustite — Proust ite, n. [From the French chemist, J. L. Proust.] (Min.) A sulphide of arsenic and silver of a beautiful cochineal red color, occurring in rhombohedral crystals, and also massive; ruby silver. [1913 Webster] …   The Collaborative International Dictionary of English

  • proustite — ● proustite nom féminin (de J. L. Proust, nom propre) Arséniosulfure naturel d argent, rhomboédrique, de couleur rouge groseille …   Encyclopédie Universelle

  • proustite — Red Red, a. [Compar. {Redder} ( d?r); superl. {Reddest}.] [OE. red, reed, AS. re[ a]d, re[ o]d; akin to OS. r[=o]d, OFries. r[=a]d, D. rood, G. roht, rot, OHG. r[=o]t, Dan. & Sw. r[ o]d, Icel. rau[eth]r, rj[=o][eth]r, Goth. r[ a]uds, W. rhudd,… …   The Collaborative International Dictionary of English

  • proustite — prou·stì·te s.f. TS mineral. minerale di colore grigio a riflessi rossi e lucentezza metallica che cristallizza nel sistema trigonale ed è utilizzato per l estrazione dell argento {{line}} {{/line}} DATA: 1895. ETIMO: der. di Proust, nome del… …   Dizionario italiano

  • proustite — prustitas statusas T sritis chemija apibrėžtis Mineralas. formulė Ag₃AsS₃ atitikmenys: angl. proustite rus. прустит …   Chemijos terminų aiškinamasis žodynas

  • proustite — noun Etymology: French, from Joseph L. Proust died 1826 French chemist Date: 1835 a mineral that consists of a red sulfide of silver and arsenic and occurs in crystals or massively …   New Collegiate Dictionary

  • proustite — /prooh stuyt/, n. Mineral. a mineral, silver arsenic sulfide, Ag3AsS3, occurring in scarlet crystals and masses: a minor ore of silver; ruby silver. [1825 35; named after J. L. PROUST; see ITE1] * * * ▪ mineral       a sulfosalt mineral, silver… …   Universalium

  • proustite — noun A mineral, AgAsS, often found with pyragyrite in silver veins …   Wiktionary

  • proustite — (prou sti t ) s. f. L arsénio sulfure d argent, qui a été étudié par Proust …   Dictionnaire de la Langue Française d'Émile Littré

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