12.1" Quartz Crystal Cluster - Brazil
This is a beautiful cluster of quartz crystals from Brazil. There is a small amount of iron oxidation on the exterior of these crystals. The cluster weighs 17.4 lbs and the underside of the specimen has been cut flat for presentation purposes.
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.