KAlSi3O8Monoclinic
Moonstone
KAlSi3O8
SilicatesChemical FormulaKAlSi3O8
Crystal SystemMonoclinic
Mohs Hardness6
Specific Gravity2.56
ColorColorless, white, peach, blue sheen
LusterVitreous to pearly
StreakWhite
CleavageTwo directions
FractureUneven
Occurrence
Variety of feldspar showing adularescence (blue-white schiller effect).