periclase

(pĕrˈĭ-klāsˌ, -klāzˌ)

noun
A mineral form of magnesium oxide, MgO, usually occurring in cubic crystals or grains.

Origin:

Origin: German Periklas

Origin: : Greek peri-, intensive pref.; see peri-

Origin: + Greek klasis, breaking (from its perfect cleavage); see orthoclase

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