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Barium carbonate occurring in white or gray six-sided twin crystals, and also in columnar or granular masses.

A hydrous carbonate of nickel occurring as an emerald-green incrustation on chromite; -- called also emerald nickel.

a) -- Zinc bloom Etym: [cf. G. zinkblumen flowers of zinc, oxide of zinc] (Min.), hydrous carbonate of zinc, usually occurring in white earthy incrustations; -- called also hydrozincite. -- Zinc ethyl (Chem.), a colorless, transparent, poisonous liquid, composed of zinc and ethyl, which takes fire spontaneously on exp…