Sanidine
Chemical Formula	(K,Na)(Si,Al)4O8
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	6
Specific Gravity	2.52
Color	Colorless to white
Streak	White
Luster	Vitreous
Refractive Index	n = 1.518 - 1.525 n = 1.523 - 1.530 n = 1.525 - 1.531
Diaphaneity	Transparent, Translucent
Cleavage	Perfect Perfect, distinct
Fracture	Irregular/Uneven, Conchoidal
Crystal Habit：Tabular crystals, may be acicular
Geological Setting：Acidic volcanic rocks