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EnglishTHE SCHOLAR'S LEXICON

plagioclase

/pley-jee-uh-kleys/US // ˈpleɪ dʒi əˌkleɪs //UK // (ˈpleɪdʒɪəʊˌkleɪz) //

斜长石,斜长岩,正长石,斜长石类

Definitions

n.名词 noun
  1. 1
    • : any of the feldspar minerals varying in composition from acidic albite, NaAlSi3O8, to basic anorthite, CaAl2Si2O8, found in most igneous rocks: shows twinning striations on good cleavage surfaces.

Examples

  • The rock—which also contains the plain-old mineral plagioclase—includes pink spinel, a prized jewel on Earth.

  • The felted or hyalopilitic texture is the most common, and plagioclase is the principal groundmass constituent.

  • There is also some variation in the amount of quartz present, and in the relative importance of the orthoclase and plagioclase.

  • Vogesites contain hornblende and orthoclase; spessartites, hornblende and plagioclase.

  • Minettes contain biotite and orthoclase; kersantites, biotite and plagioclase.

  • Essentially it is a crystalline-granular compound of plagioclase, generally Labradorite and diallage.

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