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The Collaborative International Dictionary
Albite

Albite \Al"bite\, n. [L. albus white.] (Min.) A mineral of the feldspar family, triclinic in crystallization, and in composition a silicate of alumina and soda. It is a common constituent of granite and of various igneous rocks. See Feldspar.

Wiktionary
albite

n. (label en mineral) A plagioclase feldspar, the first member of the Albite-Anorthite solid solution series.

WordNet
albite

n. a widely distributed rock-forming feldspar [syn: white feldspar]

Wikipedia
Albite

Albite is a plagioclase feldspar mineral. It is the sodium endmember of the plagioclase solid solution series. As such it represents a plagioclase with less than 10% anorthite content. The pure albite endmember has the formula Na Al Si O. It is a tectosilicate. Its color is usually pure white, hence its name from Latinalbus. It is a common constituent in felsic rocks. Albite crystallizes with triclinic pinacoidal forms. Its specific gravity is about 2.62 and it has a Mohs hardness of 6 - 6.5. Albite almost always exhibits crystal twinning often as minute parallel striations on the crystal face. Albite often occurs as fine parallel segregations alternating with pink microcline in perthite as a result of exolution on cooling.

There are two variants of albite, which are referred to as low albite and high albite; the latter is also known as analbite. Although both variants are triclinic, they differ in the volume of their unit cell, which is slightly larger for the high form. The high form can be produced from the low form by heating above c. 750 °C (1382 °F). Upon further heating to more than c. 1050 °C the crystal symmetry changes from triclinic to monoclinic; this variant is also known as monalbite.

It occurs in granitic and pegmatite masses, in some hydrothermal vein deposits and forms part of the typical greenschist metamorphic facies for rocks of originally basaltic composition.

It was first reported in 1815 for an occurrence in Finnbo, Falun, Dalarna, Sweden.

Usage examples of "albite".

Basically, a process called metamorphism caused the basalts in Shenandoah to recrystallize with new minerals, such as chlorite, epidote, and albite, which help give the rocks their greenish hue.

The best-known locality is Fronolen near Tremadoc in North Wales, where crystals of the thin tabular habit occur with crystallized quartz, albite and anatase on the walls of crevices in diabase.

In chemical composition and in optical and other physical characters it is thus much nearer to the anorthite end of the series than to albite.

The best-known locality is Fronolen near Tremadoc in North Wales, where crystals of the thin tabular habit occur with crystallized quartz, albite and anatase on the walls of crevices in diabase.

We had our best results with an albite lens focusing the rays of the full moon on the spellchecker chamber that holds the memory microimps.

Nelvine: Nelvine is the common name of albite, a variety of white feldspar.