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ruizite : ウィキペディア英語版
ruizite

Ruizite is a sorosilicate mineral with formula Ca2Mn2Si4O11(OH)4·2H2O. It was discovered at the Christmas mine in Christmas, Arizona, and described in 1977. The mineral is named for discoverer Joe Ana Ruiz.
==Description and occurrence==

Ruizite is translucent and orange to red-brown in color with an apricot yellow streak.〔 The mineral occurs as euhedral prisms up to or as radial clusters of acicular (needle-like) crystals.〔
Ruizite is common at the Christmas mine. The mineral is known from Arizona, Pennsylvania, and Northern Cape Province, South Africa.〔 Ruizite occurs in association with apophyllite, bornite, calcite, chalcopyrite, datolite, diopside, grossular, inesite, junitoite, kinoite, orientite, pectolite, quartz, smectite, sphalerite, vesuvianite, and wollastonite. Ruizite is found in veinlets or fracture surfaces of limestone metamorphosed into a calc-silicate assemblage. The mineral formed by retrograde metamorphism during cooling of a calc–silicate skarn assemblage in an oxidizing environment.〔

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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