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
What is bytownite?
Bytownite is a calcium-rich member of the plagioclase feldspar solid-solution series. Its composition lies between labradorite and anorthite.
Where does the name bytownite come from?
The name comes from Bytown, the former name of Ottawa, Canada. The term was introduced in the nineteenth century for material found near that location.
Is bytownite the same as anorthite?
No. Bytownite is compositionally between labradorite and anorthite, so it is part of the same feldspar series but is not identical to either end member.
What kind of mineral group includes bytownite?
Bytownite belongs to the plagioclase feldspar series. Plagioclase minerals vary continuously in composition between sodium-rich and calcium-rich members.
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