Word Study
euclase
CIDE DICTIONARY
euclase, n. [Gr. e'y^ well, easily + to break. Cf. F. euclase, G. euklas. See named from its brittleness.].
A brittle gem occurring in light green, transparent crystals, affording a brilliant clinodiagonal cleavage. It is a silicate of alumina and glucina. [1913 Webster]
For further exploring for "euclase" in Webster Dictionary Online