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Diameter, mm (1mm - 0,039inch)

Polished stones - full range in stock "Albite"

Albite is a widespread mineral from the feldspar group, belonging to the plagioclase subgroup. It is a rock-forming mineral of acidic and alkaline igneous rocks and pegmatites. One of the minerals that is called moonstone.

You can see albite stone for sale and buy it in the Minerals of Russia online store.

Physical properties of Albite


plagioclase, feldspar,tectosilicate

(repeating unit)

NaAlSi3O8 or Na1.0–0.9Ca0.0–0.1Al1.0–1.1Si3.0–2.9O8

IMA symbol Ab
Strunz classification 9.FA.35
Crystal system Triclinic
Crystal class
  • Pinacoidal (1)
  • (same H-M symbol)
Space group C1
Color White to gray, blueish, greenish, reddish; may be chatoyant
Crystal habit Crystals commonly tabular, divergent aggregates, granular, cleavable massive
Twinning Common giving polysynthetic striae on {001} or {010}also contact, simple and multiple
Cleavage Perfect on {001}, very good on {010}, imperfect on {110}
Fracture Uneven to conchoidal
Tenacity Brittle
Mohs scale hardness 6–6.5
Luster Vitreous, typically pearly on cleavages
Streak White
Diaphaneity Transparent to translucent
Specific gravity 2.60–2.65
Optical properties Biaxial (+)
Refractive index nα = 1.528–1.533 nβ = 1.532–1.537 nγ = 1.538–1.542
Birefringence δ = 0.010
2V angle 85–90° (low); 52–54° (high)
Dispersion r < v weak
Melting point 1,100–1,120 °C (2,010–2,050 °F)
Other characteristics Low- and high-temperature structural modifications are recognized
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