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Noun: bluestone  'bloo,stown
  1. Bluish-grey sandstone used for paving and building
Noun: blue stone  bloo stown
  1. Hydrated blue crystalline form of copper sulphate
    - blue vitriol, blue copperas, chalcanthite

Derived forms: blue stones, bluestones

Type of: copper sulfate, copper sulphate [Brit, Cdn], cupric sulfate, cupric sulphate [Brit, Cdn], sandstone

Encyclopedia: Bluestone, Pembrokeshire

Blue stone