Mineral Information and Data:

Albite
NaAlSi3O8 [CNMNC approved formula]

Named from Latin, albus - white, alluding to its usual color.

IMA status : Valid species (Pre-IMA 1815) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
76.01.03.01  
  (76) Tectosilicate Al-Si Framework
  (76.01) with Al-Si frameworks
  (76.01.03) Plagioclase series
  
Nickel-Strunz
(10th edition) :
09.FA.35
  (09) Silicates
  (09.F) Tektosilicates without Zeolitic H2O
  (09.FA) Tektosilicates without additional non-tetrahedral anions
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
Space group: C1
Unit cell: a = 8.14 Ǻ, b = 12.79 Ǻ, c = 7.16 Ǻ, a = 94.3°, b = 116.6°, g = 87.7°
Crystal Habit: Crystals tabular, small; usually massive, lamellar, or granular
Twinning: Very common by albite law; common by pericline law; also by Carlsbad, Baveno, or Manebach law
  
Color: White to colorless, bluish, gray, reddish, greenish
Diaphaneity: Transparent to translucent
Luster: Vitreous, pearly on cleavages
Hardness (Mohs): 6 to 6.5
Measured Density: 2.60 to 2.63 g/cm3
Cleavage: 3; {001}perfect, {010} nearly perfect, {110} imperfect
Tenacity: Brittle
Fracture: Uneven to conchoidal
Streak: White
  
Polymorphism and Series: Low- and high-temperature structural modifications are recognized.
Geologic Setting: A major constituent of granites and granite pegmatites, alkalic diorites, basalts, and in hydrothermal and alpine veins. A product of potassium metasomatism and in
low-temperature and low-pressure metamorphic facies and in some schists. Detrital and authigenic
in sedimentary rocks.
Mineral Association: Quartz, orthoclase, muscovite, biotite, hornblende series
  
Synonyms/varieties: Cleavelandite (platy var.), soda feldspar, sodium feldspar, plagioclase [An 0-10]
Other Properties: Gemstone Readily Available.

 

Albite
Albite crystals. Area 6mm of platy crystals.
Origin: Hendre quarry, Glyn Ceiriog, Denbighshire (Clwyd), Wales, UK
Photo : Steve Rust

 

Albite
Origin: Mogok, Burma
Sample size: 7.5 x 5 x 4.5 cm
Photo : Rob Lavinsky

 

Albite
Origin: Gluringen, Rhone Valley, Switzerland
Sample size: 2 x 2.5 x 2.5 cm
Photo : Dan Weinrich

 

Albite
(zoom-in of above)

 

Albite
Variety peristerite
Origin: Macomb, New York, United States
Ex. Eaton Collection
Sample size: 6 x 3.5 x 5 cm
Photo : Tom Loomis

 

Albite
(zoom-in of above)

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