A calcium-rich plagioclase present in many basic igneous rocks.
- They range from bytownite - labradorite in basalts and gabbros, andesine - oligoclase in diorites and andesites to albite in granites and rhyolites.
- 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, + -ite1.
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