Largest deposit of pure black jade, called nephrite, is discovered in China, and it could revolutionize the world of jewelry.

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David R. Montgomery does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations ...

IF a small steel ball is dropped from a height of a few inches on a polished rock salt surface, the imprint of the ball on the crystal surface remains as a circular depression of one or two ...