This Specimen has been sold.
4.8" Quartz and Chalcopyrite Crystal Association - Peru
This gorgeous specimen contains an association of glistening chalcopyrite crystals, what appear to be grey tetrahedrite crystals, and quartz crystals. It comes from the Huanzala Mine in Peru and the entire piece measures 4.8" wide.
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.
Chalcopyrite is a brass-yellow colored mineral which is one of the most important ores of copper. When weathered chalcopyrite loses it's metallic luster, turning a gray-green color. When acids are present the tarnish can develop a red to blue to purple iridescence.