Adularia
Chemical Formula	KAlSi3O8
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	6
Specific Gravity	2.55-2.63
Color	Colorless, Greenish, Grayish yellow, White, Pink
Streak	white
Luster	Vitreous, pearly on cleavage surfaces
Refractive Index	nα = 1.518–1.520nβ = 1.522–1.524nγ = 1.522–1.525
Diaphaneity	Transparent to translucent
Cleavage	Has perfect cleavage on and good cleavage on . Cleavages intersect at 90°. It can be difficult to see cleavage in thin section due to orthoclase's low relief.
Crystal Habit：Can be anhedral or euhedral. Grains are commonly elongate with a tabular appearance.