Amethyst with Cristobalite Superb Amethyst Color 8.89 ct Cushion Cut 13.00 x 11.90 x 8.00 mm Brazilmax2829
Amethyst 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.Best piece I ever had.
Size: 13.00 x 11.90 x 8.00 mm.
Weight: 8.89 ct