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Quartz with cristobalite octagon ct.7.59



231,80 €

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Quartz with cristobalite octagon ct.7.59

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Quartz with Cristobalite The Cristobalite is one of the three silica forms, it crystallized at an higher temperature compare to quartz: 1710C° instead for the quartz is 870 C° and the tridimite is 1470C°. Generally the crystals are fibrous-rounded balls and in this amethyst are very visible. Unusual stone for collector. From Brazil. Size:12.6x11x7 mm. Weight:7.59 ct. CODE#1143

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