Jisho

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おうどうこう 黄銅鉱
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Noun
1. copper pyrites; fool's gold; chalcopyrite​
Wikipedia definition
2. Chalcopyrite​Chalcopyrite is a copper iron sulfide mineral that crystallizes in the tetragonal system. It has the chemical composition CuFeS2. It has a brassy to golden yellow color and a hardness of 3.5 to 4 on the Mohs scale. Its streak is diagnostic as green tinged black. On exposure to air, chalcopyrite oxidises to a variety of oxides, hydroxides and sulfates.
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