bluestone

== English == === Etymology === From blue +‎ stone. === Pronunciation === === Noun === bluestone (countable and uncountable, plural bluestones) Any of several bluish-grey varieties of stone used for construction: (UK) A form of dolerite which appears blue when wet or freshly broken. (UK) Any of the several (massive) kinds of non-local stone (particularly dolerite) used to construct Stonehenge. (US, Canada) A feldspathic sandstone found in the US and Canada. (US) A form of limestone found in the Shenandoah Valley and some other places. (Australia, New Zealand) A bluish-grey basalt or olivine basalt. (Australia, South Australia) Slate, such as comes from quarries in or near Adelaide. Either of two related copper- and sulfur-based bright blue stones: 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. Chalcanthite, a water-soluble sulfate mineral, CuSO4·5H2O. Lapis lazuli, or its core constituent, lazurite. ==== Translations ==== ==== See also ==== sarsen Stonehenge === Verb === bluestone (third-person singular simple present bluestones, present participle bluestoning, simple past and past participle bluestoned) (transitive) To treat or dose with copper sulfate. === Anagrams === blue notes