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periclase

[per-i-kleys, -kleyz]
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noun
  1. a cubic mineral, native magnesia, MgO, occurring usually in metamorphosed dolomite.

Origin of periclase

1835–45; < German Periklas < New Latin periclasia, equivalent to peri- peri- + Greek klás(is) a breaking (cf. -clase) + -ia -ia
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for periclase

periclase

noun
  1. a mineral consisting of magnesium oxide in the form of isometric crystals or grains: occurs in metamorphosed limestone
Derived Formspericlastic (ˌpɛrɪˈklæstɪk), adjective

Word Origin

C19: from New Latin periclasia, from Greek peri very + klasis a breaking, referring to its perfect cleavage
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012