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Chalcedony Variety Agate Quartz. Dimensions cm cm cm Quartzlined geode with typical Barros Cassal swirl pattern in agate fluoresces green under SW UV Purchased at TGMS sale December Collection of Dennis Tryon Achat Variett von Chalcedon Gre cm cm cm Fundort Barros Cassal Rio Grande do Sul Brasilien mindat org html mindat