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keyite

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名詞

keyite

  1. (鉱物学) A monoclinic-prismatic azure mineral containing arsenic, cadmium, calcium, copper, hydrogen, manganese, oxygen, and zinc.

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ウィキペディア英語版

出典:Wikipedia

Keyite

出典:『Wikipedia』 (2011/02/12 22:15 UTC 版)

英語による解説

ウィキペディア英語版からの引用
引用

Keyite is a mineral with the chemical formula Cu2+ 3Zn 4Cd 2(AsO 4)6 · 2H 2O. The name comes from Charles Locke Key (1935-present), an American mineral dealer who furnished its first specimens. Keyite is monoclinic-prismatic, meaning its crystal form has three unequal axes, two of which have 90° angles between them and one with an angle less than 90°. Keyite belongs to the biaxial optical class, meaning it has more than one axis of anisotropy (optic axis), in which light travels with zero birefringence, and three indices of refraction, nα = 1.800, nβ, and nγ = 1.870. Being a very rare cadmium copper arsenate, keyite is only found in Tsumeb, Namibia in the Tsumeb mine, a world famous copper mine known for its abundance of rare and unusual minerals.

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