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 (pĕr′ĭ-klās′, -klāz′)
A mineral form of magnesium oxide, MgO, usually occurring in cubic crystals or grains.

[German Periklas : Greek peri-, intensive pref.; see peri- + Greek klasis, breaking (from its perfect cleavage); see orthoclase.]


(Minerals) 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]
periclastic adj
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Noun1.periclase - a white solid mineral that occurs naturally as periclasepericlase - a white solid mineral that occurs naturally as periclase; a source of magnesium
atomic number 12, magnesium, Mg - a light silver-white ductile bivalent metallic element; in pure form it burns with brilliant white flame; occurs naturally only in combination (as in magnesite and dolomite and carnallite and spinel and olivine)
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition