8" Sowbelly Agate (Amethyst) Slab - Colorado

Sowbelly Agate, also known as Vein Amethyst, is a formation of banded chalcedony, quartz and amethyst. It is especially unique because most specimens contain dendritic native silver branching throughout the chalcedony. This gorgeous material is collected from the Last Chance Mine in Creede, Colorado and is considered the throw-away material (tailings).

Amethyst is a purple variety of quartz (SiO2) that owes its violet color to natural gamma irradiation, iron impurities, and the presence of trace elements, which result in complex crystal lattice substitutions. It is considered a semi-precious gemstone, and just two centuries ago was considered to have a value on par with diamonds, sapphires, and rubies. The largest and best known amethyst deposits occur in southern Brazil and Uruguay, where they are found in hydrothermally-formed geodes, but many localities around the world produce an amazing variety of amethyst crystals and formations. They are almost always formed in medium- to high-temperature geological settings.