Gorgeous, 4.1" Botryoidal Chalcedony Formation - Morocco

This is a beautiful geode section that contains a botryoidal chalcedony formation within the cavity. It was collected from the Atlas Mountains of Sidi Rahal, Morocco.

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.
Quartz var. Chalcedony
Sidi Rahal, Atlas mountains, El Kelaa des Sraghna province, Morocco
4.1 x 2.2"