This amethyst crystal features a prominent spheroidal inclusion of cristobalite. The amethyst itself is primarily a termination, with the remainder being bounded by angular, tapering striated contact faces. The cristobalite is a ball of radiating crystals – there are two other bisected cristobalite spheres at the periphery of the piece that show this structure well under magnification. Associated with the main cristobalite inclusion are tiny sprays of goethite needles. There is a chip on one edge of the amethyst crystal. This is a great cristobalite inclusion, and gorgeous colour for its setting.