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English Dictionary: dioptase by the DICT Development Group
1 result for dioptase
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Dioptase \Di*op"tase\, n. [Gr. [?] = dia` through + [?] to see:
      cf. F. dioptase.] (Min.)
      A hydrous silicate of copper, occurring in emerald-green
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