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From Silliman + -ite. Named after American chemist and geologist Benjamin Silliman (1779-1864) in 1824.
Etymology from Wiktionary, CC BY-SA 4.0.
sillimanite
Today it means: A fibrous neosilicate mineral, polymorphic with andalusite and kyanite, with the chemical formula Al₂SiO₅. Full definition →