Artificial intelligent assistant

acanthite

acanthite Min.
  (əˈkænθaɪt)
  [f. Gr. ἄκανθα a thorn + -ite formative of names of minerals.]
  ‘A native sulphide of silver, found at Freiberg, etc.; crystals usually slender-pointed prisms; color iron-black or like argentite.’ Dana.

Oxford English Dictionary

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