This Specimen has been sold.
Large, 15" Wide Quartz Crystal Cluster - Brazil
This is a huge cluster of quartz crystals from Brazil. There is a small amount of iron oxidation on the exterior of some of these crystals. Most of the crystals are all in excellent condition and only a few of the crystals have polished facets. The cluster weighs over 24-1/2 lbs and sits nicely on a flat surface without the need for a display stand.
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.