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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.
Best Answer: Phyllite is a metamorphic rock that was once slate and was on the way to becoming a mica schist under the temperature and pressure of metamorphism. The flakes you see are mica, which are not dangerous at all. Phyllite has some chlorite in it, which is a greenish mineral, so if you don't see anything like that, the rock might be a mica schist. Your rock is certainly rare over most of the US. but where it does occur it can generally be found in fairly large quantities.