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Short "hint"

n. - A reddish mineral consisting of hydrated cobalt arsenate in monoclinic crystalline form and used in coloring glass.

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Usage examples (4)
  • It combines with erythrite, forming another tannoid, erythrine.
  • Cobalt produces the violet-red color in erythrite, (cobalt arsenic sulfide).
  • Under weathering conditions these minerals oxidize readily to form asbolite, a mixture of cobalt and manganese oxides, and the pink arsenate, erythrite or "cobalt bloom."
  • A couple examples of these ores are erythrite.
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