Muscovite
KAl2[(0H,F) AlSi3O10]
![Muscovite - KAl2[(0H,F) AlSi3O10]](../bilder/kristalle/fabricated-Mica-2585.jpg "Muscovite - KAl2[(0H,F) AlSi3O10]")
![Muscovite - KAl2[(0H,F) AlSi3O10]](../bilder/kristalle/fabricated-Mica-2590.jpg "Muscovite - KAl2[(0H,F) AlSi3O10]")
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Chemical name
Muscovite |
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Chemical formula
KAl2[(0H,F) AlSi3O10] |
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Melting point [°C]
∼ 1320 |
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Crystal system
monoclinic |
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Crystal Class
Prismatic (2/m) |
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Space Group
C62h-C2 |
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Unit cell
a [Å]:5,19 b [Å]:9,04 c [Å]:20,08 |
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Molecular weight [g/mol]
398.71 |
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Formula units
Z=4 |
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Twinning
Common on the [310], less common on the {001} |
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Mohs hardness
2 - 2.5, 4 |
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Density [g/cm3]
2.77 - 2.88 |
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Cleavage
(001) perfect |
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Refractive Index
nα = 1.552–1.576, nβ = 1.582–1.615, nγ = 1.587–1.618 |
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Birefringence δ
0.035 - 0.042 |
