The story
From Bytown + -ite, named for the type locality in Bytown (now Ottawa), Canada, but this locality was later discredited. The name, however, was kept.
Etymology from Wiktionary, CC BY-SA 4.0.
bytownite
Today it means: A plagioclase feldspar, the fifth member of the Albite-Anorthite solid solution series. Bytownite is rare, and normally occurs in small grains in lime-rich igneous rocks. Clear pale yellow crystals have come from Mexico and Oregon. Full definition →