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mimetite : ウィキペディア英語版
mimetite

Mimetite, whose name derives from the Greek Μιμητής ''mimetes'', meaning "imitator", is a lead arsenate chloride mineral (Pb5(AsO4)3Cl) which forms as a secondary mineral in lead deposits, usually by the oxidation of galena and arsenopyrite. The name is a reference to mimetite's resemblance to the mineral pyromorphite. This resemblance is not coincidental, as mimetite forms a mineral series with pyromorphite (Pb5(4)3) and with vanadinite (Pb5(4)3). Notable occurrences are Mapimi, Durango, Mexico and Tsumeb, Namibia.
==Uses of mimetite==

Industrially, mimetite is a minor ore of lead. The chief use of mimetite is as a collector's specimen, often creating attractive botryoidal crusts on the surface of the specimen. Though mimetite is also found in prismatic crystal forms, it is not used as a gemstone due to its softness. Quality prismatic forms have been found in Johanngeorgenstadt in Saxony and Wheal Unity at Gwennap in Cornwall, England.

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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