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Albite

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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 NaAlSi3O8. It is a tectosilicate. Its color is usually pure white, hence its name from Latin albus. 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.

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WordNet 2.0 Dictionary

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albite

Noun
1. a widely distributed rock-forming feldspar
(synonym) white feldspar
(hypernym) plagioclase, oligoclase


Babylon French English dictionary

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albite
nf. albite, a widely distributed rock-forming feldspar

Webster's Revised Unabridged Dictionary (1913)

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Albite
(n.)
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.
  

Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About

Mineralogy Database Dictionary

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Albite

General Information:
 Chemical Formula:
NaAlSi3O8
 Composition:
(Molecular Weight = 263.02 gm)
Sodium 8.30 % Na
Calcium 0.76 % Ca
Aluminum 10.77 % Al
Silicon 31.50 % Si
Oxygen 48.66 % 
 Empirical Formula:
Na0.95Ca0.05Al1.05Si2.95O8
 Environment:
Magmatic and pegmatitic rocks.
 Locality:
TL: USA, VA, Amelia. Bourg d'Oisans and Isere, France.
 Name Origin:
From the Latin, albus, in allusion to the common color.
Physical Properties:
 Cleavage:
[001] Perfect, [010] Good
 Color:
white, gray, greenish gray, bluish green, or gray.
 Density:
2.61 - 2.63, Average = 2.62
 Diaphaniety:
Transparent to translucent to subtranslucent
 Habits:
Blocky - Crystal shape tends to be equant (e.g. feldspars)., Striated - Parallel lines on crystal surface or cleavage face., Granular - Generally occurs as anhedral to subhedral cryst als in matrix.
 Hardness:
7 - Quartz
 Luminescence:
None.
 Luster:
Vitreous (Glassy)
 Streak:
white
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