4.3" Amazonite Crystal Cluster - Colorado

This is a lovely, teal blue amazonite crystal cluster mined from the 10 Percenter Claim in Park County, Colorado. Smoky quartz crystals can be found along the underside of this specimen. The largest amazonite crystal is .75" wide.

Amazonite is a green variety of microcline feldspar that is the state mineral of Colorado. It has recently received lot of attention for its prominence on the reality show, “Prospectors” which follows several groups of Colorado mineral miners. In fact, most of our amazonite is sourced from some of the prospectors on the show. High quality amazonite crystals are found at several locations in Colorado, often in vugs associated with smoky quartz.

The name comes from the Amazon River, where it was thought Amazonite was originally found, though it’s now thought doubtful that it occurs in the region. For years it was thought that the green color was due to copper content, but we now know that it’s due to very small quantities of lead present in the mineral.

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.

Smoky quartz is a grey-brown to black variety of quartz. This common name is derived from from the appearance of smoke within the quartz crystal. Dependent on the location and the chemicals present during formation, smoky quartz can appear opaque black, however it’s typically translucent to some extent. It’s believed that the quartz gains this color from a combination of natural irradiation and aluminum impurities.

Microcline var. Amazonite & Quartz var. Smoky
10 Percenter Claim, Lake George, Park County, Colorado
4.3 x 3.8". Largest crystal .76" wide