| Definitions | noun (plural: labradorites)
- (mineralogy) A plagioclase feldspar, the fourth member of the Albite-Anorthite solid solution series. Often very coarsely crystalline, it is used as a decorative stone for carvings and building faí§ades. Crystal surfaces often show a bluish reflection called "Schiller", which resembles the reflections from a butterfly's wing.
- Chemical composition: Calcium sodium aluminum silicate, <math>Ca_xNa_xAlSi_3O_8</math>
- Physical properties:
Moh's Hardness: 6.0
Specific gravity: 2.71
Color: Usually bluish-gray to dark gray
Luster: glassy
Fracture: conchoidal
Cleavage: two good at about 94º to each other
- Habit: Triclinic - pinacoidal. Crystals are common and usually striated.
Etymology: Named for the type locality in Labrador.
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