per·i·clase (p r  -kl s , -klz)n. 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.] |
periclase [ˈpɛrɪˌkleɪs]
n
(Earth Sciences / Minerals) a mineral consisting of magnesium oxide in the form of isometric crystals or grains: occurs in metamorphosed limestone
[from New Latin periclasia, from Greek peri very + klasis a breaking, referring to its perfect cleavage]
periclastic [ˌpɛrɪˈklæstɪk] adj
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  periclase - a white solid mineral that occurs naturally as periclase; a source of magnesiumatomic 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 |
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