bytownite


Also found in: Dictionary, Wikipedia.

bytownite

[′bī·tau̇‚nīt]
(mineralogy)
A plagioclase feldspar with a composition ranging from Ab30 An70 to Ab10 An90, where Ab = NaAlSi3O8 and An = CaAl2Si2O8; occurs in basic and ultrabasic igneous rock.