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Quartz with cristobalite drop ct.7.39



146,40 €

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Quartz with cristobalite drop ct.7.39

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Quartz with Cristobalite and Goethite 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. The tiny needles in the forms of sprout brush are Goethite. Unusual stone for collector. From Brazil. Size:17.2x9.5x6.3 mm. Weight: 7.39 ct. CODE# 1397

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