4.4" Dark Green, Hedenbergite Included Quartz - Mongolia
This is a gorgeous cluster of deep green quartz crystals that were collected from the Huanggang Mines of Inner 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 and/or backlighting the crystals.
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.