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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An orthorhombic-disphenoidal mineral containing hydrogen, nickel, oxygen, and sulfur.

from The Century Dictionary and Cyclopedia

  • n. Hydrous nickel sulphate, NiSO4+7H2O, usually occurring in fibrous forms or as an efflorescence of a green color. It results from the alteration of nickel ores.


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