Euclase
Pronunciation : Eu"clase n.
Etymology : [Gr. euclase, G. euklas. See named from its brittleness.] (Min.)
Definition : Defn: A brittle gem occurring in light green, transparent crystals, affording a brilliant clinodiagonal cleavage. It is a silicate of alumina and glucina.
Source : Webster's Unabridged Dictionary, 1913