a white or gray feldspar mineral, CaAl 2 Si 2 O 8 , calcic plagioclase.
anorthite occurs in white translucent or transparent crystals.
Geology James Geikie
anorthite is an essential constituent of many basic igneous rocks, such as gabbro and basalt, also of some meteoric stones.
Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 Various
Rougemonite consists largely of anorthite with pyroxene as the only important ferro-magnesian constituent.
Montreal 1535-1914 under the French Rgime William Henry Atherton
Like labradorite and anorthite, it is a common constituent of basic igneous rocks, such as gabbro and basalt.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 Various
a white to greyish-white or reddish-white mineral of the feldspar group and plagioclase series, found chiefly in igneous rocks and more rarely in metamorphic rocks. It is used in the manufacture of glass and ceramics. Composition: calcium aluminium silicate. Formula: CaAl2Si2O8. Crystal structure: triclinic
A white to gray triclinic mineral of the plagioclase feldspar group. Anorthite is the plagioclase mineral that is richest in calcium and occurs in alkaline igneous rocks such as gabbro. Chemical formula: CaAl2Si2O8.
adjective another word for triclinic Historical Examples The name anorthite was given to the Vesuvian mineral by G. Rose in 1823, on account of its anorthic crystallization. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 Various
a variety of microcline, rich in sodium and sometimes having a play of color: sometimes considered a variety of . anorthoclase (ān-ôr’thə-klās’) A white to colorless triclinic mineral of the alkali feldspar group. It is a common constituent in the matrices of slightly alkaline volcanic rocks. Chemical formula: (Na,K)AlSi3O8.
anorthography anorthography an·or·thog·ra·phy (ān’ôr-thŏg’rə-fē) n. See agraphia.
a granular plutonic rock composed largely of labradorite or a more calcic feldspar. Historical Examples In Canada great portions of the eastern portion of the Dominion are formed of gabbros, norite, anorthosite and allied rock types. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 Various noun a coarse-grained plutonic igneous rock consisting almost entirely of […]