Plagioclase

Na(AlSi3O8) * Ca(Al2Si2O8)

Plagioclase - Na(AlSi3O8) * Ca(Al2Si2O8)
Chemical name
Plagioclase
Mineral name
Plagioclase
Chemical formula
Na(AlSi3O8) * Ca(Al2Si2O8)
Crystal system
triclinic
Molecular weight [g/mol]
270.77
Mohs hardness
6 - 6,5
Density [g/cm3]
2.6 - 2.7
Cleavage
(001) perfect, (010) good
Color
White, gray, bluish white
Streak
White
Transparency
Transparent to translucent
Luster
Vitreous
Refractive Index
Albite: nα 1.527, nβ 1.532 nΥ 1.538 Anorthite: nα 1.577 nβ 1.585 nΥ 1.590