08/27/2026
Good morning, it’s Crystal Thursday! Today we are talking about the final plagioclase feldspar cousin. This one is not Labradorite and looks different from what we might expect of a plagioclase feldspar. We are discussing the beautifully unique, odd cousin out, Bytownite.
Bytownite sits between Labradorite and Anorthite on the plagioclase feldspar series. It’s more calcium rich than Labradorite, and while it might not look like its flashy cousin, some specimens have their own beautiful iridescent flash. Most stones I’ve found on the market are light yellow, but Bytownite can also be deeper yellow, grey or white. It is found in Canada, Mexico, Australia, Norway and the United States.
Bytownite came to the geological record from material collected near what is now Ottawa, Canada. Many sources credit engineer John By, for whom the community of Bytown was named. In my research, however, I found documentation pointing to physician and mineral collector Andrew Holmes as the person who collected the specimens. Holmes sent them to Scottish chemist Thomas Thomson for examination. Thomson studied the feldspar and named it Bytownite for the community near where it was found.
The story gets even more interesting. In 1871, Ferdinand Zirkel examined a specimen identified as Bytownite and determined it was a mixture of several minerals. However, that specimen came through a mineral dealer and its provenance is uncertain, so it may not have been the same material Thomson originally examined.
In the spiritual and metaphysical community, Bytownite resonates with the Solar Plexus Chakra. When looking at its geology and mineralogy, that association makes sense to me. Its energy feels lighter and faster than the other plagioclase feldspars. As I’ve worked with it, I’ve noticed feeling more creative, confident, focused and proactive.
On the surface, Bytownite may not look much like the other feldspars we’ve explored. Its internal structure may not be as visible, and even its transformation energy feels different. But Bytownite is a reminder that transformation doesn’t always have to be deep or difficult. Sometimes it can be lighter, brighter and even full of joy.