Bytownite
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Physical & Optical Properties
Mohs Hardness
Crystal System
Value & Market
Where to Buy Bytownite
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About Bytownite
Bytownite is a calcium-rich plagioclase feldspar near the anorthite end of the series, typically appearing white to gray in rock-forming contexts but occasionally yielding transparent golden yellow gem crystals from Mexico and Norway. These golden faceted bytownites—sometimes marketed as 'Mexican sunstone'—are soft but display an attractive warm color and vitreous luster. Named after Bytown, the former name of Ottawa, Canada, where it was first described.