Bytownite

A variety of anorthite; plagioclase feldspar with an albite:anorthite molar ratio ranging from 10:90 to 30:70.

See:

Material from ‘Repository’

3 specimens: 0133 — 2.00 ct, Mexico; 0284 — 2.28 ct, Mexico; 0484 — 0.62 ct, Mexico.

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Gemmology — gemstones
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The specimens illustrated in this site do not exist in the collections of the National Museum of Natural History, Sofia.