Hypertext Webster Gateway: "periclase"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (wn)
periclase
n : a white solid mineral that occurs naturally as periclase; a
source of magnesium [syn: {magnesia}, {magnesium oxide}]
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