Periclasite

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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.
     [1913 Webster]