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Andesine

(Ca,Na)(Al,Si)4O8

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