Definitions
bytownite Tweet Definition of bytownite Like Definition of bytownite on Facebook
noun (plural: bytownites)
  1. (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.
  • 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
    Luster: glassy
    Fracture: conchoidal
    Cleavage: two good at about 94º to each other
  • Habit: Triclinic - pinacoidal. Crystals are rare.
Etymology: Named for the type locality in Bytown, Canada, but this locality was later discredited. The name, however, was kept.


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