Albite
Na[AlSi3O8]
![Albite - Na[AlSi3O8]](../bilder/kristalle/NaA1Si3O8-1467.jpg "Albite - Na[AlSi3O8]")
![Albite - Na[AlSi3O8]](../bilder/kristalle/NaA1Si3O8-1469.jpg "Albite - Na[AlSi3O8]")
![Albite - Na[AlSi3O8]](../bilder/kristalle/NaA1Si3O8-1471.jpg "Albite - Na[AlSi3O8]")
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Chemical name
Albite |
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Chemical formula
Na[AlSi3O8] |
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Melting point [°C]
1100 - 1120 |
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Crystal system
triclinic |
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Crystal Class
Pinacoidal |
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Space Group
C1 |
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Unit cell
a [Å]:8,13 b [Å]:12,79 c [Å]:7,15 |
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Molecular weight [g/mol]
262.223 |
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Formula units
Z=4/8 |
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Mohs hardness
6 - 6.5 |
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Cleavage
(001) perfect, (010) very good, (110) imperfect |
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Fracture / Tenacity
Brittle |
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Color
White to gray, blueish, greenish, reddish |
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Transparency
Transparent to translucent |
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Refractive Index
nα = 1.528-1.533, nβ = 1.532-1.537, nγ = 1.538-1.542 |
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Birefringence δ
0.010 |
