(Na,Ca)(Al,Si)4O8Triclinic
Labradorite
(Na,Ca)(Al,Si)4O8
SilicatesChemical Formula(Na,Ca)(Al,Si)4O8
Crystal SystemTriclinic
Mohs Hardness6.5
Specific Gravity2.7
ColorGray, green, blue, yellow
LusterVitreous
StreakWhite
CleavageTwo directions
FractureUneven
Occurrence
Variety of plagioclase feldspar showing labradorescence (play of colors).