copperas : Idioms & Phrases

Index

blue copperas

  • noun hydrated blue crystalline form of copper sulfate
    blue stone; chalcanthite; blue vitriol.
WordNet

White copperas

  • (Min.), a native hydrous sulphate of iron; coquimbite.
Webster 1913

Yellow copperas

  • (Min.), a hydrous sulphate of iron; called also copiapite.
Webster 1913