Dims: 12.1 x 8.2 x 4.6" (10.3 x 20.8 x 11.7 cm)
Wt: 13.2 lbs. (6.0 kg)
Minas Gerais, Brazil
This cut and partly polished section of a geode is lined with hundreds of Amethyst crystals. These crystals are in excellent condition due to the protective nature of their environment and reach lengths and diameters of over 1" (2.5 cm). All have excellent hexagonal prismatic form, with well-defined edges and generally clean faces. Most of these crystals are intergrown just beneath their terminations, but a few have visible prism lengths. All have a pale violet coloration and the standard vitreous luster, and are cloudy and translucent to dimly transparent. Some of the crystals that line the bottom of the interior are also coated with thin layers of colorless calcite. A few trigonal calcite "dogteeth" rest among the crusts. Almost no agate separates the Amethyst druse from the dark green lava "skin" that coats the outer surface of the geode.