Min. [a. Fr. euclase, f. Gr. εὐ- (see EU-) + κλάσ-ις breaking, f. κλά-ειν to break; so called on account of its easy cleavage.] A silicate of aluminium and glucinum occurring in light-green, transparent crystals.
1804. W. Nicholson, trans. Fourcroy’s Chem., II. 412. The primative form of euclase is a right rectangular prism.
1822. Imison, Sc. & Art, II. 93. Glucina … has been procured from … the euclase.
1868. Dana, Min., 380. Euclase receives a high polish, but is useless as an ornamental stone on account of its brittleness.
1874. Westropp, Man. Prec. Stones, 25. The euclase is also of the same chemical composition as the emerald.
