...The main ones are quartz (SiO 2 ) , corundum (Al 2 O 3 ) , feldspars (orthoclase (KAlSi 3 O 8 ) , albite (NaAlSi 3 O 8 ), anorthite (CaAl 2 Si 2 O 8 ), feldspars (nepheline (NaAlSiO 4 ) , leucite (KAlSi 2 O 6 ) , caryophyllite (KAlSiO 4 ), etc. On the other hand, a group of minerals characterized by MgO, FeO, and CaO are called femic minerals (although some do not contain these). The main ones are olivine (forsterite Mg 2 SiO 4 , fairite Fe 2 SiO 4 ), diopside (wollastonite CaSiO 3 , enstatite MgSiO 3 , ferrosilite FeSiO 3 ), hypersine (enstatite, ferrosilite), magnetite Fe 3 O 4 , ilmenite FeTiO 3 , apatite 3Ca 3 (PO 4 ) 2 ・CaF 2 , etc. … *Some of the terminology explanations that mention "femic" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…おもなものは,石英SiO2,コランダムAl2O3,長石(正長石KAlSi3O8,アルバイトNaAlSi3O8,アノーサイトCaAl2Si2O8),準長石(ネフェリンNaAlSiO4,リューサイトKAlSi2O6,カリオフィライトKAlSiO4)などである。一方,MgO,FeO,CaOを特徴とする一群のものをフェミックfemic鉱物と呼ぶ(なかにはそれらを含まないものもある)。おもなものは,カンラン石(フォルステライトMg2SiO4,フェアライトFe2SiO4),透輝石(ウォラストナイトCaSiO3,エンスタタイトMgSiO3,フェロシライトFeSiO3),ハイパーシン(エンスタタイト,フェロシライト),磁鉄鉱Fe3O4,イルメナイトFeTiO3,リン灰石3Ca3(PO4)2・CaF2などである。… ※「femic」について言及している用語解説の一部を掲載しています。 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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