This Specimen has been sold.
2.1" Grey Amethyst Formation - Uruguay
This is a beautiful, sparkling cluster of quartz crystals from the famous mines near Artigas, Uruguay. This cluster looks to have been cut from the rounded end of a stalactite and is slightly green in color. We import our material directly from the mines in Artigas, Urugua.
Silicon Dioxide, also know 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.