anorthite

anorthite
—anorthitic /an'awr thit"ik/, adj.
/an awr"thuyt/, n. Mineral.
a white or gray feldspar mineral, CaAl2Si2O8, calcic plagioclase.
[1825-35; AN-1 + ORTH- + -ITE1]

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Feldspar mineral, calcium aluminosilicate (CaAl2Si2O8), that occurs as white or grayish, brittle, glassy crystals.

Primarily a rock-forming mineral, it is used in the manufacture of glass and ceramics. Anorthite occurs in basic igneous rocks (see acid and basic rocks).

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      a feldspar mineral, calcium aluminosilicate (CaAl2Si2O8), that occurs as white or grayish, brittle, glassy crystals. Primarily a rock-forming mineral, it is used in the manufacture of glass and ceramics. Anorthite occurs in basic igneous rocks, as at Trentino, Italy; Södermanland, Swed.; Tamil Nadu, India; Miyake, Japan; and Franklin, N.J. For detailed physical properties, see feldspar (table).

      The feldspar minerals are mixtures of sodium, potassium, and calcium aluminosilicates; they belong to a ternary system in which any mineral may be classed by its percentage of each of three pure compounds, called end-members: sodium aluminosilicate, potassium aluminosilicate, and calcium aluminosilicate. Anorthite is the calcium-bearing end-member of the system; its symbol is An.

      Anorthite and the sodium-bearing end-member of the system, albite (NaAlSi3O8), form a solid-solution series in which the two intermingle; thus, in nature there is a continuous chemical variation between the two compounds. Any member of this series is called a plagioclase.

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Universalium. 2010.

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  • Anorthite — A*nor thite, n. [Gr. an priv. + ? straight (? sc. ? right angle); not in a right angle.] A mineral of the feldspar family, commonly occurring in small glassy crystals, also a constituent of some igneous rocks. It is a lime feldspar. See… …   The Collaborative International Dictionary of English

  • anorthite — [an ôr′thīt΄] n. [< Gr an , not + orthos, straight (see ORTHO ) + ITE1] a white or grayish variety of plagioclase, CaAl2Si2O8, found in basic igneous rocks anorthitic [an ôr′thit′ik] adj …   English World dictionary

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  • anorthite — noun A plagioclase feldspar, the final member of the Albite Anorthite solid solution series. Anorthite is very rare on Earth, but abundant in moon rocks. This is because Anorthite weathers rapidly to clay minerals under atmospheric conditions.… …   Wiktionary

  • anorthite — anortitas statusas T sritis chemija apibrėžtis Mineralas. formulė Ca[Al₂Si₂O₈] atitikmenys: angl. anorthite rus. анортит …   Chemijos terminų aiškinamasis žodynas

  • anorthite-basalt — noun : a rock consisting of a basic variety of basalt with anorthite instead of labradorite …   Useful english dictionary

  • anorthite — noun Etymology: French, from a + Greek orthos straight Date: 1833 a white, grayish, or reddish feldspar occurring in many igneous rocks • anorthitic adjective …   New Collegiate Dictionary

  • anorthite — [ə nɔ:θʌɪt] noun a calcium rich mineral of the feldspar group, typically white. Origin C19: from an 1 + Gk orthos straight + ite1 …   English new terms dictionary

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