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cerargyrite

cerargyrite Min.
  (sɪˈrɑːdʒɪraɪt)
  [improperly f. Gr. κέρας (κερατ-) horn + ἄργυρος silver + -ite.]
  Native chloride of silver, horn silver.

1868 Dana Min. 115 Ceratargyrite, the proper derivative, being contracted to cerargyrite.

Oxford English Dictionary

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