Igneous rocks poor in silicon dioxide. A solid solution of akermanite (Ca 2 MgSi 2 O 7 ) , gehlenite (Ca 2 Al 2 SiO 7 ) , and sodamerillite (NaCaAlSi 2 O 7) as end members. Also called melite or meliite. Hardness 5-6, specific gravity 2.95-3.05. Yellow, brown, or greenish brown, tetragonal crystal system. Often plate-like or short columnar. Found in basaltic rocks including nepheline and leucite. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
二酸化ケイ素に乏しい火成岩。オケルマナイト Ca2MgSi2O7 ,ゲーレナイト Ca2Al2SiO7 ,ソーダメリライト NaCaAlSi2O7 を端成分とする固溶体。メリ石,黄長石とも呼ばれる。硬度5~6,比重 2.95~3.05。黄,褐,緑褐色で正方晶系の鉱物。多くの場合板状または短柱状。ネフェリン,リューサイトなどを含む玄武岩質岩石に含まれる。
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