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ARGENTITE

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Originally appearing in Volume V02, Page 475 of the 1911 Encyclopedia Britannica.
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ARGENTITE , a See also:

mineral which belongs to the See also:galena See also:group, and is cubic See also:silver sulphide (Ag2S). It is occasionally found as uneven cubes and octahedra, but more often as dendritic or earthy masses, with a blackish See also:lead-See also:grey See also:colour and metallic lustre. The cubic cleavage, which is so prominent a feature in galena, is here See also: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 See also:veins, and when found in large masses, as in See also:Mexico and in the Comstock lode in See also:Nevada, it forms an important ore of silver. The mineral was mentioned so See also:long ago as 1529 by G. See also:Agricola, but the name argentite (from the See also:Lat. argentum, " silver ") was not used till 2845 and is due to W. von See also:Haidinger. Old names for the See also:species are Glaserz, silver-glance and vitreous silver. A cupriferous variety, from Jalpa in See also:Tabasco, Mexico, is known as jalpaite. Acanthite is a supposed dimorphous See also:form, crystallizing in the orthorhombic See also:system, but it is probable that the crystals are really distorted crystals of argentite. (L. J.

End of Article: ARGENTITE

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