2.2" Citrine Crystal Cluster - Lwena, Congo

The primary difference between citrine and smoky quartz is color; this stone is also often known as smoky citrine due to its yellowish smoky color. This is the natural color it was when found and has not been heat-treated or altered in any way.

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.