what is Petra dura ?
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Pietra dura, (Italian: “hard stone”), in mosaic, any of several kinds of hard stone used in commesso mosaic work, an art that flourished in Florence particularly in the late 16th and 17th centuries and involved the fashioning of highly illusionistic pictures out of cut-to-shape pieces of coloured stone
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Petra dura is an Italian phrase that means "hard stone," and usually refers to the technique of creating intricate inlaid pictures from shaped colored stones. The stones used are usually silicates, including agates, alabaster, amethyst, jade, usually silicates, malachite, onyx, and topaz.
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