- a cubic mineral, native magnesia, MgO, occurring usually in metamorphosed dolomite.
Origin of periclase
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a mineral consisting of magnesium oxide in the form of isometric crystals or grains: occurs in metamorphosed limestone
C19: from New Latin periclasia, from Greek peri very + klasis a breaking, referring to its perfect cleavage