zoisite
nounA gray, brown, pink, or blue mineral, Ca2Al3(SiO4)3(OH), used in ornamental stonework.
nounA mineral closely related to epidote, but orthorhombic in crystallization.
nounA grayish or whitish mineral occurring in orthorhombic, prismatic crystals, also in columnar masses. It is a silicate of alumina and lime, and is allied to epidote.
nounA