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Corderoite
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Corderoite : ウィキペディア英語版
Corderoite

Corderoite is an extremely rare mercury sulfide chloride mineral with formula Hg3S2Cl2. It crystallizes in the isometric crystal system. It is soft, 1.5 to 2 on the Mohs scale, and varies in color from light gray to black and rarely pink or yellow.
It was first described in 1974 for occurrences in the McDermitt Mercury mine in Humboldt County, Nevada. The name is from the old name of the mine, the ''Old Cordero Mine.''〔http://www.mindat.org/loc-4206.html Mindat McDermii Mine page〕
== Structure ==
Corderoite has crankshaft chains that are crosswise linked by additional Hg²+. The bond distance between the cation Hg and anion S is 2.422 Angstroms. It has two angles, Hg-S-HG= 94.1º and S-Hg-S= 165.1º. Various sulfide halides of
Hg share the feature of being face-sharing () −6 polyhedral, as corderoite's polyhedra X=Cl.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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