This is a huge, double Amethyst point from Minas Gerais, Brazil. The point is 8.5" long and displays very nicely on a flat surface.
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.