DIALLAGE, noun [Gr., difference, alluding to the difference of luster between its natural joints.] A mineral, the smaragdite of Saussure, of a lamellar or foliated structure. Its subspecies are green diallage metalloidal diallage and bronzite. The metalloidal subspecies is called schillersteing, or shiller spar.
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Webster's Dictionary 1828
American Dictionary of the English Language, Noah Webster, 1828.