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Encyclopedia Britannica



BYTOWNITE

This article appears in Volume V04, Page 906 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: BUN-CAL
BYTOWNITE , a
rock
 -forming
mineral
  belonging to the plagioclase (q.v.)
series
  of the felspars. The name was originally given (1835) by T.
Thomson
 , to a greenish-
white
  felspathic
mineral
  found in a boulder near Bytown (now the city of
Ottawa
 ) in Ontario, but this material was later shown on microscopical examination to be a mixture. The name was afterwards applied by G. Tschermak to those plagioclase felspars which lie between labradorite and anorthite; and this has been generally adopted by petrologists. In chemical composition and in
optical
  and other
physical
  characters it is thus much nearer to the anorthite end of the
series
  than to albite. Like labradorite and anorthite, it is a common constituent of basic igneous rocks, such as gabbro and basalt. Isolated crystals of bytownite bounded by well-defined faces are unknown. (L. J. S.)


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