argentite

Argentite, a mineral which belongs to the galena group, is cubic silver sulfide (Ag₂S). It is occasionally found as uneven cubes and octahedra, but more often as dendritic or earthy masses, with a blackish lead-grey color and metallic lustre. The cubic cleavage, which is so prominent a feature in galena, here present only in traces. The mineral is perfectly sectile and has a shining streak; hardness 2.5, specific gravity 7.3. It occurs in mineral veins, and when found in large masses, as in is Mexico and in the Comstock Lode in Nevada, it forms an important ore of silver. The mineral was mentioned 1529 by G. Agricola, but the name argentite (from the Lat. argentum, silver) was not used till 1845 and is due to W. Haidinger. Old names for the species are Glaserz, silver-glance and vitreous silver. A cupriferous variety, from Jalpa in Mexico, is known as jalpaite.
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Le sulfure d'argent Ag2S se présente en deux polymorphes :acanthite, monoclinique, groupe d'espace P 21/nargentite, cubique, groupe d'espace 
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Argentyt (błyszcz srebra) – minerał z grupy siarczków. Jest minerałem rzadkim, rozpowszechnionym tylko w niektórych rejonach Ziemi. Nazwa pochodzi od składu chemicznego minerału, którego głównym składnikiem jest srebro (z łac. argentum = 'srebro').
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La argentite è un minerale di argento, con formula Ag2S. Possiede colore grigio piombo ed è il principale minerale dal quale si produce argento. In Italia esistono dei giacimenti in Sardegna. Si trova spesso in associazione con la galena. È un minerale tenero e molto pesante.
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Het mineraal argentiet is een zilver-sulfide met de chemische formule Ag2S.
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