a blue to dark-gray mineral near the anorthite end of the plagioclase feldspar group.

Origin of bytownite

1865–70; named after Bytown (old name of Ottawa, Canada), where first found; see -ite1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Science definitions for bytownite



A bluish to dark gray triclinic mineral of the plagioclase feldspar group that contains a higher proportion of calcium than sodium. Bytownite occurs in alkaline igneous rocks. Chemical formula: (Ca,Na)(Si,Al)4O8.
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