Genuine pearls consist of concentric layers of calcite crystals (CaCO 3 ) in which the trigonal axes
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Genuine pearls consist of concentric layers of calcite crystals (CaCO3) in which the trigonal axes are oriented along the radii. The nucleus of a cultured pearl is a piece of mother-of-pearl that has been worked into a sphere on a lathe. The oyster then deposits concentric layers of calcite on the central seed. Suggest an X-ray method for distinguishing between real and cultured pearls.
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