KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8Triclinic/Monoclinic
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8
SilicatesChemical FormulaKAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8
Crystal SystemTriclinic/Monoclinic
Mohs Hardness6
Specific Gravity2.56
ColorWhite, pink, brown, gray
LusterVitreous
StreakWhite
CleavageTwo directions at 90
FractureUneven
Occurrence
Most abundant mineral group in Earth crust. Major component of granite.