Large, 6.9" Smoky Quartz Crystal - Brazil

 
This is a cluster of large smoky quartz crystals from Brazil. The entire cluster is 6.9 inches wide and the largest crystal is 6.3 inches long. These massive crystals damage free terminations and a beautiful smokey coloration. It has not been heated or treated to change the natural color.

This specimen comes with a stand for display.

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.
DETAILS
SPECIES
Quartz var. Smoky
LOCATION
Minas Gerais, Brazil
SIZE
6.9" long, 5.6" wide. Longest point 7.4"
CATEGORY
SUB CATEGORY
ITEM
#61237