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Whitby jet a black organic gem a rock similar to coal,what is jet? jet is a black organic rock that forms when pieces of woody material are buried in sediment and are coalified. though very similar to coal, it is less friable.jet can be cut, carved, and polished to a bright luster. people have used jet for thousands of years to produce gemstones, beads, and many other objects.jet is one of just a few organic gemstones.
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