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Dominant species
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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.
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