Definitions from Wiktionary (Bluestone)

▸ noun:  Any of several bluish-grey varieties of stone used for construction:
▸ noun:  (UK) A form of dolerite which appears blue when wet or freshly broken.
▸ noun:  (UK) Any of the several (massive) kinds of non-local stone (particularly dolerite) used to construct Stonehenge.
▸ noun:  (US, Canada) A feldspathic sandstone found in the US and Canada.
▸ noun:  (US) A form of limestone found in the Shenandoah Valley and some other places.
▸ noun:  (Australia, New Zealand) A bluish-grey basalt or olivine basalt.
▸ noun:  (Australia, South Australia) Slate, such as comes from quarries in or near Adelaide.
▸ noun:  Either of two related copper- and sulfur-based bright blue stones:
▸ noun:  Copper(II) sulfate, CuSO₄(H₂O)ₓ where x is 0-5, used as a coloring agent in glass-making and pottery and for other purposes.
▸ noun:  Chalcanthite, a water-soluble sulfate mineral, CuSO₄·5H₂O.
▸ noun:  Lapis lazuli, or its core constituent, lazurite.
▸ verb:  (transitive) To treat or dose with copper sulfate.
▸ noun:  A surname.
▸ Also see bluestone



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