A hydrous silicate mineral rich in Fe and containing small amounts of Al and Mg. Its chemical composition is (K,Na,Ca)(Fe3 + , Fe2 + , Mg,Al) 12 (Si,Al) 18 (O,OH ) 54 ・ nH2O . Some types are mainly Fe2+ and others are mainly Fe3 + . Triclinic crystal system. It has a complex layered structure. It has fine black leaflets and resembles biotite, but is more brittle than mica, with slightly incomplete basal cleavage and some perpendicular cleavage. Mohs hardness 3-4, specific gravity 2.6-3. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
Feに富み,少量のAl,Mgなどを含む含水ケイ酸塩鉱物。化学組成は(K,Na,Ca)(Fe3+,Fe2+,Mg,Al)12(Si,Al)18(O,OH)54・nH2Oで表される。Fe2+を主とするものとFe3+を主とするものがある。三斜晶系。複雑な層状構造をもつ。黒色の微細な葉片状をなし,黒雲母に似るが,雲母よりもろく,底面のへき開はやや不完全で,これに直交するへき開もある。モース硬度3~4,比重2.6~3。
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