Albite

Na[AlSi3O8]

Albite - Na[AlSi3O8]Albite - Na[AlSi3O8]Albite - Na[AlSi3O8]
Chemical name
Albite
Mineral name
Albite
Chemical formula
Na[AlSi3O8]
Melting point [°C]
1100 - 1120
Crystal system
triclinic
Crystal Class
Pinacoidal
Space Group
C1
Unit cell
a [Å]:8,13
b [Å]:12,79
c [Å]:7,15
Molecular weight [g/mol]
262.223
Formula units
Z=4/8
Mohs hardness
6 - 6.5
Cleavage
(001) perfect, (010) very good, (110) imperfect
Fracture / Tenacity
Brittle
Color
White to gray, blueish, greenish, reddish
Transparency
Transparent to translucent
Refractive Index
nα = 1.528-1.533,
nβ = 1.532-1.537,
nγ = 1.538-1.542
Birefringence δ
0.010