Anorthoclase
Chemical Formula	(Na,K)AlSi3O8
Species	Silicates
Crystal System	Triclinic
Mohs Scale	6
Specific Gravity	2.57-2.60
Color	Colorless, also white, pale creamy yellow, red, green
Streak	White
Luster	Vitreous to pearly on cleavage planes
Refractive Index	n = 1.519 - 1.529 n = 1.524 - 1.534 n = 1.527 - 1.536
Diaphaneity	Transparent
Cleavage	Perfect
Fracture	Uneven
Crystal Habit：Short prismatic crystals; tabular, rhombic, flattened along