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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.
Ruby is defined as âred corundum.â Chromium is what makes a corundum gemstone red. âAll other varieties of corundum,â anything not red, are classified as sapphires. (Sapphires may contain a mix of chromium, titanium, and iron traces). Although sapphires are popularly associated with the color blue, they include all non-red colored corundum gems.