periclase

per·i·clase  (pr-kls, -klz)

n.

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

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

Thesaurus

Noun

1.

periclase - a white solid mineral that occurs naturally as periclase; a source of magnesium magnesia, magnesium oxide 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