“biotite”的意思、由来-百科全书

biotite

mineral

also called black mica,

a silicate mineral in the common mica group. It is abundant in metamorphic rocks (both regional and contact), in pegmatites, and also in granites and other intrusive igneous rocks. For chemical formula and detailed physical properties, see mica (table).

Biotite is regarded as a mixture composed of variable proportions of four basic aluminosilicates of potassium, iron, magnesium, or aluminum: annite, K₂Fe₆(Si₆Al₂O₂₀)(OH)₄; siderophyllite, K₂Fe₅Al(Si₅Al₃O₂₀)(OH)₄; phlogopite, K₂Mg₆(Si₆Al₂O₂₀)(OH)₄; and eastonite, K₂Mg₅A1(Si₅Al₃O₂₀)(OH)₄. Biotite is arbitrarily designated as having a magnesium-to-iron ratio less than 2:1.

词条	biotite
释义	biotite mineral also called black mica, a silicate mineral in the common mica group. It is abundant in metamorphic rocks (both regional and contact), in pegmatites, and also in granites and other intrusive igneous rocks. For chemical formula and detailed physical properties, see mica (table). Biotite is regarded as a mixture composed of variable proportions of four basic aluminosilicates of potassium, iron, magnesium, or aluminum: annite, K₂Fe₆(Si₆Al₂O₂₀)(OH)₄; siderophyllite, K₂Fe₅Al(Si₅Al₃O₂₀)(OH)₄; phlogopite, K₂Mg₆(Si₆Al₂O₂₀)(OH)₄; and eastonite, K₂Mg₅A1(Si₅Al₃O₂₀)(OH)₄. Biotite is arbitrarily designated as having a magnesium-to-iron ratio less than 2:1.
随便看	Wŏnju Wŏnsan X X-1 X-15 Xai-Xai Xalapa Xankändi Göttingen, University of Göttinger Hain Götz, Hermann Götz von Berlichingen Güines Güira de Melena Güiraldes, Ricardo Gül Baba Gümüşhane Gümüşpala, Ragıp Güntekin, Reșat Nuri Günter Blobel Günter Grass Günther Günther, Ignaz Günther, Johann Christian Günther von Kluge