Cassiterite (Cassiterite)

Japanese: スズ石(錫石) - すずいし(英語表記)cassiterite
Cassiterite (Cassiterite)
The most important ore of tin. Chemical composition: SnO 2 . Tetragonal crystal system. Usually short columnar. A collection of fine radiating crystals is called cassiterite. Friable. Yellow-brown, reddish-brown, or blackish-brown in color with a diamond or metallic luster. Mohs hardness: 6-7. Specific gravity: 6.99. Streaks: white, gray, or brown. Cassiterite is found in small amounts in granite, pegmatite, contact metasomatic deposits, and hydrothermal deposits, but tin-bearing granite weathers to form large cassiterite placer deposits in hot and humid areas such as Malaysia and Indonesia.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
スズの最も重要な鉱石。化学組成SnO2。正方晶系。通常は短柱状。放射同心構造の微細結晶の集合体は木スズ石と呼ばれる。もろい。黄褐色,赤褐色,黒褐色で,ダイヤモンドないし金属光沢。モース硬度6~7。比重6.99。条痕は白色,灰色,褐色。スズ石は花コウ岩,ペグマタイト,接触交代鉱床,熱水鉱床などに少量含まれているが,含スズ花コウ岩がマレーシア,インドネシアなどの高温多湿地域で風化し大規模なスズ石の砂鉱床を形成している。

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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