from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A gray, brown, or pink mineral, Ca2Al3(SiO4)3(OH), used in ornamental stonework.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A mineral with orthorhombic crystals, Ca2Al3(SiO4)(Si2O7)O(OH).
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. A mineral closely related to epidote, but orthorhombic in crystallization.
The severe crushing to which the rock has been subjected has resulted in the conversion of the plagioclase into scapolite and also in the formation of zoisite by the characteristic alteration of the lime bearing silicate of the feldspar in conjunction with other constituents of the rock.
When a blue zoisite came across Tiffany & Co.'s desk in the late 1960s, the company was quick to identify a fatal flaw.
(i) Merelani in Kiteto District, Arusha Region - famous for the mining of tanzanite (a blue-violet zoisite).