Orthoclase / Sanidin
K(AlSi3O8)
|
Chemical name
Orthoclase / Sanidin |
|
Chemical formula
K(AlSi3O8) |
|
Crystal system
monoklin |
|
Space Group
C2/m |
|
Unit cell
a [Å]:8,56 b [Å]:13,03 c [Å]:7,17 |
|
Formula units
Z=4 |
|
Mohs hardness
6 |
|
Density [g/cm3]
2.55 - 2.63 |
|
Cleavage
(001) perfect, (010) good |
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Color
Colorless to white, Greenish white, Grayish yellow, Pale pink |
|
Transparency
Transparent, Translucent |
|
Luster
Vitreous, Sub-Vitreous, Resinous |
|
Refractive Index
nα = 1.518-1.520, nβ = 1.522-1.524, nγ = 1.522-1.525 |
|
Birefringence δ
0.005-0.006 |
