This Specimen has been sold.
2.3" Anatase Crystal and Quartz - Hardangervidda, Norway
This beautiful specimen contains an association of a small, metallic, twinned anatase crystal and quartz crystals. The crystals formed from a schist matrix that was collected from Hardangervidda, Norway. The anatase crystal on this specimen measures in at .1" long.
Anatase is composed of titanium dioxide, and typically forms dipyramidal crystals, although variations can occur with mineral clumping. Four pointed X-shaped anatase crystals, while rare, have been found and are known as "X-shaped penetration twins". Horizontal striations can be seen across most anatase mineral faces, with most crystals ending in points, or with variations of flattening on each end.
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.