This is a stunning, 6.2" wide cluster of light, amethyst crystals from the mines in Minas Gerais, Brazil. The crystals are in excellent condition with wonderful terminations. The plate displays well both sitting on a flat surface and on the included display stand.
Amethyst is a purple variety of quartz (SiO2) and owes its violet color to natural irradiation, iron impurities, and the presence of trace elements, which result in complex crystal lattice substitutions. It’s considered a semi-precious gemstone, and just two centuries ago was considered to have a value on par with diamonds, sapphires and rubies.
Much of the world’s amethyst comes from extensive deposits in Southern Brazil that have been heavily mined for about a century. The amethyst occurs in large cavities or geodes
within volcanic rocks and the coloration and crystal size can vary greatly.