This Specimen has been sold.
4.2" Chalcedony Stalactite Formation - Morocco
This is a beautiful section of rock that contains chalcedony stalactite formations, collected from Morocco. The layers of chalcedony formation can be seen in various spots throughout the specimen.
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.