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It was called by the Romans, from the use made of it in fabricating measures of weight, lapis æquipondus, and from its supposed efficacy in the cure of diseases of the kidneys lapis nephriticus. Fabreti says that it got the name of lapis Lydius from the locality from which it was believed to have come. It is a kind of nephrite or jade, a mineral which usually occurs in talcose or magnesian rocks.
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