Andesine
(Ca,Na)(Al,Si)4O8
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Chemical name
Andesine |
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Chemical formula
(Ca,Na)(Al,Si)4O8 |
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Crystal system
triclinic |
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Crystal Class
Pinacoidal |
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Space Group
P1 |
|
Unit cell
a [Å]:8.155 b [Å]:12.9 c [Å]:9.16 |
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Mohs hardness
6 - 6.5 |
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Cleavage
(001) perfect, (010) good |
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Fracture / Tenacity
Brittle |
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Color
White, gray, green, yellow, flesh-red |
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Transparency
Transparent to translucent |
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Luster
Subvitreous to pearly |
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Refractive Index
nα = 1.543-1.554, nβ = 1.547-1.559, nγ = 1.552-1.562 |
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Birefringence δ
0.009 |
