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bluestone, common name for the blue, crystalline heptahydrate of cupric sulfate called chalcanthite, a minor ore of copper.ore on bluestone from Infoplease: 1  bluestone: meaning and definitions-bluestone: Definition and Pronunciation. 2  Irving Bluestone-Biography of Irving Bluestone, Chief negotiator for General Motors employees in the 1970s and advocate of worker participation in management.
Also called titanite for its titanium content, sphene is a stone with brilliance that can exceed diamond, though of far lower hardness compared to the latter. Beside yellow and red, sphene also occurs as green gemstones, usually with yellow undertone. The green stones are very rare, and accordingly more expensive.