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 |