Argentite
In mineralogy, argentite (Script error: No such module "params".) is cubic silver sulfide (Ag2S), which can only exist at temperatures above Template:Cvt,[1] Template:Cvt,[2] or Template:Cvt.[3] When it cools to ordinary temperatures it turns into its monoclinic polymorph, acanthite.[2][3] The International Mineralogical Association has decided to reject argentite as a proper mineral.[3]
The name "argentite" sometimes also refers to pseudomorphs of argentite: specimens of acanthite which still display some of the outward signs of the cubic crystal form, even though their actual crystal structure is monoclinic due to the lower temperature.[2][1] This form of acanthite is occasionally found as uneven cubes and octahedra, but more often as dendritic or earthy masses, with a blackish lead-grey color and metallic luster.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
Argentite belongs to the galena group. Cleavage, which is so prominent a feature in galena, here presents only in traces. The mineral is perfectly sectile and has a shining streak; hardness 2.5, specific gravity is 7.2–7.4. It occurs in mineral veins, and when found in large masses, as in Mexico and in the Comstock Lode in Nevada, it forms an important ore of silver. The mineral was mentioned in 1529 by G. Agricola, but the name argentite was not used till 1845 and is due to W. Haidinger. Old names for the species are Glaserz, silver-glance and vitreous silver. A related copper-rich mineral occurring e.g. in Jalpa, Zacatecas, Mexico, is known as jalpaite.Lua error in package.lua at line 80: module 'Module:Footnotes/anchor_id_list' not found.
References
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- ^ a b Page Module:Citation/CS1/styles.css has no content."Argentit" (in Deutsch). Mineralienatlas Lexikon.
- ^ a b c Page Module:Citation/CS1/styles.css has no content."Argentite". mindat.org.
- ^ a b c Page Module:Citation/CS1/styles.css has no content.Argentite Mineral Data, WebMineral.com
- This article incorporates text from a publication now in the public domain: Script error: No such module "template wrapper".
External links
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