zoisite

noun

A gray, brown, pink, or blue mineral, Ca2Al3(SiO4)3(OH), used in ornamental stonework.

noun

A mineral closely related to epidote, but orthorhombic in crystallization.

noun

A 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.

noun

A mineral with orthorhombic crystals, Ca2Al3(SiO4)(Si2O7)O(OH).