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It is often the case that marbles and granites used in homes are not actually marble and granite but are some other type of rock. In this case you might have a rock like Blueschist or one containing high amounts of the mineral glaucophane. There could be some accessory elements staining the rock (which is what causes the different colors of quartz crystals like smokey quartz or amethyst). Also rocks can and often are subjected to dyes as in the case with some gemstone dealers.

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