This Specimen has been sold.
2.9" Green Pyromorphite Crystals on Quartz - China
This is a unusual cluster of vibrant green pyromorphite crystals on quartz, collected from the Daoping Mine in the Guangxi Zhaung Autonomous Region of China. These two crystals aren't typically found associated with each other.
Pyromorphite is a mineral species composed of lead chlorophosphate: Pb5(PO4)3Cl, sometimes occurring in sufficient abundance to be mined as an ore of lead. It forms small, hexagonal crystals ranging from dark green to yellow, to orange. The lead in pyromorphite can be harmful if absorbed into the blood stream by inhalation or ingestion. The crystals won't pose a health hazard just sitting on a shelf but it would be recommended to wash your hands after handling.
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.