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 — [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-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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