This Specimen has been sold.
3.5" Druzy Quartz "Stalactite" Formation On Wood Base - Uruguay
This is a gorgeous quartz "stalactite" crystal formation from the famous mines near Artigas, Uruguay. This specimen comes with a removable wood base that it sits in for display. The top of the stalactite has been cross-sectionally cut and polished to display the quartz formation within.
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.