Min. Obs. [ad. Ger. triclasit (Hausmann, 1808), f. Gr. τρι-, TRI- + κλάσ-ις breaking, fracture + -ITE1.] Obsolete synonym of FAHLUNITE.
1835. Encycl. Brit. (ed. 7), XII. 37/1. Triclasite. Specific Gravity 2·61 to 2·66.
1850. Ansted, Elem. Geol., Min., etc., § 401. Fahlunite, Triklasite, Hydrous silicate of alumina with magnesia, oxide of iron, and oxide of manganese.
1868. Dana, Min. (ed. 5), 485. The name triclasite alludes to three cleavages, and is therefore bad, as they are not cleavages of the species, but in part of the original iolite.
