5.1" Sowbelly Agate (Amethyst) Slab - Colorado

This is a gorgeous slab of Sowbelly Agate that was collected from Creede, Colorado. It features gorgeous bands of agate and microcrystalline amethyst, as well as some pockets that contain quartz/amethyst crystals. There are dendritic formation of native silver scattered throughout the slab.

Comes with an acrylic display stand.

Sowbelly Agate, also known as Vein Amethyst, is a formation of banded chalcedony, quartz and amethyst. It's 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.

Agate is a variety of microcrystalline quartz (chalcedony) that displays translucence and in some cases banding. Agate primarily forms when silica-rich fluids fill pockets within rock and/or fossils, resulting in deposition of the silica along the walls of the rock. This process can result in banding patterns as the composition and impurities of the fluids change over time. These banding patterns can either form as flat layers or rounded layers, depending on the surfaces available for deposition.

Silicon Dioxide, also known as SiO2 or Quartz, is the second most abundant mineral in the Earth's crust. Quartz crystals generally grow in silica-rich, hot watery solutions called hydrothermal environments, at temperatures between 100°C and 450°C, and usually under very high pressure. Quartz veins are formed when open fissures are filled with hot water during the closing stages of mountains forming, and can be hundreds of millions of years old.

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. The largest and best known amethyst deposits occur in southern Brazil and Uruguay but many localities around the world produce an amazing variety of amethyst crystals and formations.

Chalcedony var. Agate, Quartz var. Agate & Native Silver
Last Chance Mine, Creede, Colorado
5.1 x 3.5", .48" thick