This Specimen has been sold.
1.84" Quartz Crystal - Erongo Mountains, Namibia
Here is a sharp quartz point from the Erongo Mountains in Namibia. Although the crystal has broken away from the original host rock or matrix, it is in overall great shape, and is beautifully naturally terminated.
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.