Its chemical composition is Cu 2 (OH) 3 Cl. It is also called chlorite. It belongs to the orthorhombic crystal system and is found as plates, fibers, granular aggregates, etc. It has various shades of green and a beautiful glassy luster. It has a Mohs hardness of 3 to 3.5 and a specific gravity of 3.7. It is formed secondary to the oxidation of copper minerals. It is found especially in dry areas such as deserts. Most of it is found in the oxidation zone of copper mines in Chile and Arizona in the United States, and is used as copper ore. It is found in specimen-sized specimens in Japan. It was named after the Atacama Desert in Chile. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
化学組成はCu2(OH)3Cl。緑塩銅鉱ともいう。斜方晶系に属し,板状,繊維状,粒状集合体などとして産出する。いろいろな色合いの緑色を呈し,美しいガラス光沢をもつ。モース硬度3~3.5,比重3.7。銅鉱物が酸化されて二次的にできる。特に砂漠のような乾燥地帯に産出する。多くはチリ,アメリカのアリゾナ州などの銅鉱山の酸化帯にあり,銅鉱石として利用される。日本では標本規模で産出する。チリのアタカマ砂漠にちなんで命名された。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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