Anorthit

Ca(Al2Si2O8)

Anorthit - Ca(Al2Si2O8)Anorthit - Ca(Al2Si2O8)Anorthit - Ca(Al2Si2O8)
Chemical name
Anorthit
Mineral 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