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Huge quartz crystal mined and picked up by Otto Berg, measuring approximately 9″ x 7.75″ x 6.75″ and weighing 21 lbs. According to Berg's notes, this clear quartz crystal was discovered in Brazil during an expedition to find a specimen with specific scientific properties to be used in an experiment. It was tested for acoustical properties and was ultimately rejected for use in the experiment. In very good to fine condition.