A type of mineral in the plagioclase feldspar group, a crystal-like substance found in rocks.
Named after Bytown (now Ottawa, Canada), where it was first identified in the 1830s. The mineral name uses the '-ite' suffix common in mineralogy to indicate a mineral species.
Bytown was such an important place for mineral discovery that they literally named a mineral after it—but the city got renamed to Ottawa and nobody renamed the mineral! This is why some mineral names seem oddly connected to forgotten place names.
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