2" Sparkly, Blue-Green Quartz Chalcedony Formation - Peru

This is a fascinating formation of quartz chalcedony that was collected from the Lily Mine in Peru. The chalcedony formed in a copper-rich environment, which explains the faint blue-green color.

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.
Quartz Chalcedony
Lily Mine, Pisco Umay, Ica Department, Peru
2" wide