Bytownite
a blue to dark-gray mineral near the anorthite end of the plagioclase feldspar group.
Historical Examples
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 Various
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 5 Various
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 Various
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 Various
bytownite
(bī-tou’nīt)
A bluish to dark gray triclinic mineral of the plagioclase feldspar group. Bytownite occurs in alkaline igneous rocks. Chemical formula: (Ca,Na)(Si,Al)4O8.
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