2.8" Hematite Rosettes and Quartz Association - China
This specimen displays an association of black hematite rosettes and partial quartz crystals. There are small amounts of hematite (iron oxidation) on the quartz crystals, indicated by its orange color. Almost all of the quartz crystals on this specimen have some sort of damage to their terminations. This specimen was collected from Jinlong Hill in the Guangdong Province of China
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.