Bytownite definition

bī-tounīt
A blue to dark-gray variety of plagioclase feldspar that contains a higher proportion of calcium than sodium and occurs in alkaline igneous rocks.
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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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Other Word Forms

Noun

Singular:
bytownite
Plural:
bytownites

Origin of bytownite

  • After Bytown , former name of Ottawa, Ontario, near where a sample of the mineral was found

    From American Heritage Dictionary of the English Language, 5th Edition