periclase

periclase
[ˈpɛrɪkleɪz, -s]
noun
  1. [mass noun]a colourless mineral consisting of magnesium oxide, occurring chiefly in marble and limestone
    方镁石
语源
  1. mid 19th cent.: from modern Latin periclasia, erroneously from Greek peri 'utterly' + klasis 'breaking' (because it cleaves perfectly)
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