Anorthit
Ca(Al2Si2O8)
|
Chemical name
Anorthit |
|
Chemical formula
Ca(Al2Si2O8) |
|
Melting point [°C]
1553 |
|
Crystal system
triclinic |
|
Space Group
P1 |
|
Unit cell
a [Å]:8.1768 b [Å]:12.8768 c [Å]:14.169 |
|
Molecular weight [g/mol]
278.2073 |
|
Twinning
Common |
|
Mohs hardness
6 |
|
Density [g/cm3]
278.203 |
|
Fracture / Tenacity
Brittle |
|
Color
White, grayish, reddish |
|
Luster
Vitreous |
|
Refractive Index
nα = 1.573-1.577, nβ = 1.580-1.585, nγ = 1.585-1.590 |
|
Birefringence δ
0.012 - 0.013 |
