periclastic

World English Dictionary
periclase (ˈpɛrɪˌkleɪs)
 
n
a mineral consisting of magnesium oxide in the form of isometric crystals or grains: occurs in metamorphosed limestone
 
[C19: from New Latin periclasia, from Greek peri very + klasis a breaking, referring to its perfect cleavage]
 
periclastic
 
adj

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