description Bytownite Overview
Bytownite is a calcium-rich member of the plagioclase feldspar solid-solution series, with composition between labradorite and anorthite. The name was introduced in the nineteenth century for material found near Bytown, the former name of Ottawa, Canada; the original occurrence was later understood to be a mixture, and bytownite is now commonly treated as a compositional range or informal feldspar term rather than an IMA-approved mineral species. It usually occurs in basic igneous rocks such as gabbro and basalt. [Museum Wales mineral database](https://museum.wales/mineralogy-of-wales/database/?mineral=129&name=Bytownite)
help Bytownite FAQ
How good is Bytownite?
Bytownite scores 4.23/10 (Poor) on Lunoo, making it rated in the Gemstone category.
What are the best alternatives to Bytownite?
See our alternatives page for Bytownite for a ranked list with scores. Top alternatives include: Padparadscha Sapphire, Paraiba Tourmaline, Alexandrite.
How does Bytownite compare to Padparadscha Sapphire?
See our detailed comparison of Bytownite vs Padparadscha Sapphire with scores, features, and an AI-powered verdict.
Is Bytownite worth it in 2026?
With a score of 4.23/10, Bytownite is a solid option in Gemstone. See all Gemstone ranked.
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