Century Dictionary and Cyclopedia
- n. A hydrated silicate of aluminium, of a greenish color and micaceous structure. It occurs in prisms often six- or twelve-sided, having the form of the iolite crystals from which it has been derived by pseudomorphism.
GNU Webster's 1913
- n. (Min.) A hydrated silica of alumina, resulting from the alteration of iolite.
- Fahlun + -ite, after a place in Sweden (nowadays written Falun). (Wiktionary)
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