Definition of bytownite in English:



mass noun
  • A mineral present in many basic igneous rocks, consisting of a calcic plagioclase feldspar.

    • ‘I'm interested in some of the Bytownite but don't get paid until Saturday...’
    • ‘They range from bytownite - labradorite in basalts and gabbros, andesine - oligoclase in diorites and andesites to albite in granites and rhyolites.’
    • ‘I received a specimen of Bytownite today in the mail.’
    • ‘The groundmass consists mainly of bytownite with large grains of diopside and of colourless olivine, and small octahedrons of magnetite.’
    • ‘The highly soluble and aluminous bytownite favored the formation of allophane.’


Mid 19th century: from Bytown, the former name of Ottawa, Canada, + -ite.