Tetrahedrite

Japanese: 四面銅鉱 - しめんどうこう（英語表記）tetrahedrite

(Cu, Fe) ₁₂ Sb ₄ S ₁₃ . A copper mineral with a cubic, tetrahedral crystal structure, containing about 46% copper. Dark gray, iron black, with black streaks. Hardness 3-4, specific gravity 4.6-5.1. It occurs with silver in plutonic deposits (Kamioka), contact metasomatic deposits (Chichibu), stratified copper-bearing iron sulfide deposits (Besshi), veins (Chitose), and black ore deposits (Osaka). It is also called yukotsu ore.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

(Cu，Fe)₁₂Sb₄S₁₃ 。等軸晶系，四面体の結晶形をもつ銅の鉱物で，銅を約 46%含む。帯黒灰色，鉄黒色，条痕は黒色。硬度3 ～ 4，比重 4.6 ～ 5.1。深成鉱床 (神岡) ，接触交代鉱床 (秩父) ，層状含銅硫化鉄鉱床 (別子) ，鉱脈 (千歳) ，黒鉱鉱床 (小坂) などに銀とともに産する。黝 (ゆう) 銅鉱ともいう。

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