Orthoclase / Sanidin
K(AlSi3O8)
Chemical name
Orthoclase / Sanidin
Mineral 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
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
nβ = 1.522-1.524,
nγ = 1.522-1.525
Birefringence δ
0.005-0.006
