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bytownite
[ bahy-tou-nahyt ]
noun
- a blue to dark-gray mineral near the anorthite end of the plagioclase feldspar group.
bytownite
/ ²úÄ«-³Ù´Ç³Ü′²ÔÄ«³Ù /
- 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) 4 O 8 .
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˜yÐÄvlog History and Origins
Origin of bytownite1
1865–70; named after Bytown (old name of Ottawa, Canada), where first found; -ite 1
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Example Sentences
Examples have not been reviewed.
Of their minerals felspar Is usually the most abundant, and is principally labradorite and bytownite, though anorthite occurs in some, while oligoclase and orthoclase have been found in others.
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These intermediate members are the lime-soda felspars known as oligoclase, andesine, labradorite and bytownite.
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Practically all varieties of this mineral from anorthite to albite are known to occur in basalt, but by far the commonest species are bytownite and labradorite.
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Isolated crystals of bytownite bounded by well-defined faces are unknown.
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