bytownite definition

  • noun:
    • A plagioclase feldspar, the 5th person in the Albite-Anorthite solid option series. Bytownite is uncommon, and typically does occur in little grains in lime-rich igneous stones. Obvious pale yellow crystals have come from Mexico and Oregon.
    • a type of feldspar from Bytown (today Ottawa), Canada, intermediate between anorthite and labradorite.

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