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Definition of celsian in US English:
celsian
noun
MineralogyA colourless, white, or pale yellow mineral of the monoclinic crystal system which is a barium-containing feldspar, BaAl₂Si₂O₈, dimorphous with paracelsian and occurring mostly in association with manganese deposits.
Origin
Late 19th century; earliest use found in Mineralogy Magazine. From Swedish celsian from the name of Anders Celsius + -an.
