DCHP-1 Online
bytownite [< Bytown] 
n. a plagioclase feldspar composed of 90-70 per cent anorthite and 10-30 per cent albite.
See also: Bytown
- 1884 (1885) The feldspars, barsowite and bytownite . . . are as distinct from anorthite as they are from labradorite.
- 1889 Bytownite is the name given by Dr. Thompson to a greenish white felspathic mineral. . . .
- 1884 (1885) The feldspars, barsowite and bytownite . . . are as distinct from anorthite as they are from labradorite.