This Specimen has been sold.
2.7" Prase Quartz Crystal Cluster - Mongolia
This is a beautiful cluster of green prase quartz crystals that were collected from Mongolia. The green color of the quartz can be attributed to hedenbergite inclusions within the quartz. These needle-like inclusions become apparent when looking at the crystal's termination. Some of the crystals have some damage at their terminations.
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.