bytownite

[ bahy-tou-nahyt ]

/ baɪˈtaʊ naɪt /

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noun

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

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Origin of bytownite

1865–70; named after Bytown (old name of Ottawa, Canada), where first found; see -ite¹

Words nearby bytownite

by the short hairs, by the skin of one's teeth, by the sweat of one's brow, by the way, Bytom, bytownite, by turns, by virtue of, byway, by way of, by weight

How to use bytownite in a sentence

These intermediate members are the lime-soda felspars known as oligoclase, andesine, labradorite and bytownite.
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2|Various
These consist of hornblende (dark green) and basic plagioclase felspar, labradorite and bytownite (grey or nearly white).
Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5|Various
The felspar ranges from bytownite to oligoclase, being usually a variety of labradorite; orthoclase is scarce.
Encyclopaedia Britannica, 11th Edition, Volume 16, Slice 5|Various
Isolated crystals of bytownite bounded by well-defined faces are unknown.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4|Various

Scientific definitions for bytownite

bytownite

[ bī-tou′nīt ]

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.