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periclase

[per-i-kleys, -kleyz] /ˈpɛr ɪˌkleɪs, -ˌkleɪz/
noun
1.
a cubic mineral, native magnesia, MgO, occurring usually in metamorphosed dolomite.
Origin of periclase
1835-1845
1835-45; < German Periklas < New Latin periclasia, equivalent to peri- peri- + Greek klás(is) a breaking (cf. -clase) + -ia -ia
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for periclase

periclase

/ˈpɛrɪˌkleɪs/
noun
1.
a mineral consisting of magnesium oxide in the form of isometric crystals or grains: occurs in metamorphosed limestone
Derived Forms
periclastic (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
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