Albite

Albite is one of six species in the plagioclase feldspar series. Each species is defined by its albite and anorthite content: albite itself has the highest albite content. It is usually white, though gems are often colorless. Peristerite, an albite-oligoclase mix, has a blue sheen, like moonstone.

The best peristerite is from Canada.

Albite Properties

Chemical Composition: 
Sodium calcium aluminosilicate
Hardness: 
6
Specific Gravity: 
2.64
Lustre: 
Vitreous to pearly
Refractive Index / Birefringence: 
1.54-1.55 / 0.009
Geological Occurrence: 
Canada
Cuts & Uses: 
Brilliant, Mixed.