Iron sulfide mineral
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This refers to naturally occurring iron sulfides. The main iron sulfide minerals are pyrite (FeS 2 ) , marcasite (FeS 2 ) , troilite (FeS) (monosulfite), and pyrrhotite (Fe 1- x S) (hexagonal and monoclinic pyrrhotite), but the following are also known. Greigite (Fe 3 S 4 ) has an isometric crystal system, a Mohs hardness of 4.5-5.5, a grayish-white metallic luster, a specific gravity of 4.5-4.8, cleavage along {100} and {111}, and strong magnetism. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
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天然に産する鉄の硫化物をいう。おもな硫化鉄鉱物として黄鉄鉱FeS2，白鉄鉱FeS2，トロイライトtroilite FeS(単硫鉄鉱)，磁硫鉄鉱Fe1－xS(六方および単斜磁硫鉄鉱)があるが，ほかに次のようなものが知られている。グライガイトgreigite Fe3S4は等軸晶系でモース硬度4.5～5.5，灰白色金属光沢を示し，比重4.5～4.8，へき開は｛100｝と｛111｝に発達し，強い磁性を有する。
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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