from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A complex vitreous monoclinic mineral, hydrated copper aluminium arsenate hydroxide, with a bright blue or green colour.

from the GNU version of the Collaborative International Dictionary of English

  • n. A hydrated arseniate of copper, occurring in obtuse pyramidal crystals of a sky-blue or verdigris-green color.

from The Century Dictionary and Cyclopedia

  • n. A hydrated arseniate of copper, occurring in sky-blue or verdigris-blue crystals in several mines in Cornwall.


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