3.4" Smoky Quartz Crystal with Hematite - Colorado

This is a lustrous, dark smoky quartz crystal with a pseudomorph of hematite after siderite on one face. The color is natural and has not been enhanced by heat treatment. It was mined from a private claim near Lake George in Teller County, Colorado. It has been mounted with mineral tack for museum-quality display.

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

Hematite is a fairly common mineral, typically responsible for the red-brown colorations found in other minerals and rocks. Its chemical composition is Fe2O3, occasionally containing small amounts of titanium (variable formula (Fe,Ti)2O3). Much of the time, non-crystalline hematite specimens are the result of a transformation from limonite following loss of water.

Quartz var. Smoky & Hematite
Lake George, Teller County, Colorado
3.4" long