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1. cleavage (in gems)
2. Cleavage (crystal)Cleavage, in mineralogy, is the tendency of crystalline materials to split along definite crystallographic structural planes. These planes of relative weakness are a result of the regular locations of atoms and ions in the crystal, which create smooth repeating surfaces that are visible both in the microscope and to the naked eye.
Read “Cleavage (crystal)” on English Wikipedia
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Read “Cleavage (crystal)” on DBpedia
Read “Cleavage (crystal)” on English Wikipedia
Read “へき開” on Japanese Wikipedia
Read “Cleavage (crystal)” on DBpedia
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