Plagioclase
Chemical Formula	NaAlSi3O8 – CaAl2Si2O8
Species	Silicates
Crystal System	Triclinic
Mohs Scale	6-6.5
Specific Gravity	2.62-2.76
Color	White, gray, bluish white, reddish white, greenish white
Streak	White
Luster	Vitreous
Refractive Index	Albite: nα 1.527, nβ 1.532 nγ 1.538Anorthite: nα 1.577 nβ 1.585 nγ 1.590[1]
Diaphaneity	Transparent to translucent
Cleavage	Good on and
Crystal Habit：Massive to granular