Albite



the sodium end member of the plagioclase feldspar group, light-colored and found in alkalic igneous rocks.
Historical Examples

albite found at Mineral Hill, Pennsylvania, also exhibits the chatoyancy of moonstone.
Birds and Nature, Vol. 12 No. 2 [July 1902] Various

Some of the trachytic lavas are said to abound with crystals of albite.
Narrative of the Circumnavigation of the Globe by the Austrian Frigate Novara, Volume I Karl Ritter von Scherzer

The felspar of the granulites is mostly orthoclase or cryptoperthite; microcline, oligoclase and albite are also common.
Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 Various

Small groups of black twin crystals have been lately discovered in the albite rock of Chesterfield in Massachusetts.
A Dictionary of Arts, Manufactures and Mines Andrew Ure

Zygadite, zig′a-dīt, n. a variety of albite found in thin twin crystals at Andreasberg, in the Harz Mountains.
Chambers’s Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) Various

noun
a colourless, milky-white, yellow, pink, green, or black mineral of the feldspar group and plagioclase series, found in igneous sedimentary and metamorphic rocks. It is used in the manufacture of glass and ceramics. Composition: sodium aluminium silicate. Formula: NaALSi3O8. Crystal structure: triclinic
albite
(āl’bīt’)
A clear to milky white triclinic mineral of the plagioclase group. Albite is common in igneous rocks, especially granite, and in metamorphic rocks that formed at low temperatures. Chemical formula: NaAlSi3O8.

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