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Periclasite
Periclase Per"i*clase, Periclasite Per`i*cla"site, n. [Pref.
peri- + Gr. ? to break.] (Min.)
A grayish or dark green mineral, consisting essentially of
magnesia (magnesium oxide), occurring in granular forms or in
isometric crystals.
Meaning of Periclasite from wikipedia