bluestone

Noun

 * 1) Any of several bluish-grey varieties of stone used for construction:
 * 2)  A form of dolerite which appears blue when wet or freshly broken.
 * 3)  Any of the several (massive) kinds of non-local stone (particularly dolerite) used to construct.
 * 4)  A feldspathic sandstone found in the US and Canada.
 * 5)  A form of limestone found in the Shenandoah Valley and some other places.
 * 6)  A bluish-grey basalt or olivine basalt.
 * 7)  Slate, such as comes from quarries in or near Adelaide.
 * 8) Either of two related copper- and sulfur-based bright blue stones:
 * 9) Copper(II) sulfate, CuSO$4$(H$2$O)$x$ where x is 0-5, used as a coloring agent in glass-making and pottery and for other purposes.
 * 10) Chalcanthite, a water-soluble sulfate mineral, CuSO$4$·5H$2$O.
 * 11) Lapis lazuli, or its core constituent, lazurite.
 * 1) Either of two related copper- and sulfur-based bright blue stones:
 * 2) Copper(II) sulfate, CuSO⇭⇭⇭(H⇭⇭⇭O)⇭⇭⇭ where x is 0-5, used as a coloring agent in glass-making and pottery and for other purposes.
 * 3) Chalcanthite, a water-soluble sulfate mineral, CuSO⇭⇭⇭·5H⇭⇭⇭O.
 * 4) Lapis lazuli, or its core constituent, lazurite.
 * 1) Chalcanthite, a water-soluble sulfate mineral, CuSO⇭⇭⇭·5H⇭⇭⇭O.
 * 2) Lapis lazuli, or its core constituent, lazurite.
 * 1) Lapis lazuli, or its core constituent, lazurite.
 * 1) Lapis lazuli, or its core constituent, lazurite.
 * 1) Lapis lazuli, or its core constituent, lazurite.
 * 1) Lapis lazuli, or its core constituent, lazurite.
 * 1) Lapis lazuli, or its core constituent, lazurite.

Verb

 * 1)  To treat or dose with copper sulfate.