noun (plural: bytownites)
- (mineralogy) A plagioclase feldspar, the fifth member of the Albite-Anorthite solid solution series. Bytownite is rare, and normally occurs in small grains in lime-rich igneous rocks. Clear pale yellow crystals have come from Mexico and Oregon.
Etymology: Named for the type locality in Bytown, Canada, but this locality was later discredited. The name, however, was kept.
- Chemical composition: Calcium sodium aluminum silicate, <math>Ca_xNa_xAlSi_3O_8</math>
- Physical properties:
Moh's Hardness: 6.0
Specific gravity: 2.74
Color: White, pale yellow, shades of gray
Cleavage: two good at about 94Âº to each other
- Habit: Triclinic - pinacoidal. Crystals are rare.
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