bytownite
[ bahy-tou-nahyt ]
/ baɪˈtaʊ naɪt /
noun
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
Words nearby bytownite
Example sentences from the Web for bytownite
These intermediate members are the lime-soda felspars known as oligoclase, andesine, labradorite and bytownite.
The felspar ranges from bytownite to oligoclase, being usually a variety of labradorite; orthoclase is scarce.
Isolated crystals of bytownite bounded by well-defined faces are unknown.
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.