Smoky Quartz (with Iron Oxidation)

Physical Properties

Hardness: 7 (Mohs scale), Color: Smoky greyish-brown with reddish-orange iron staining, Luster: Vitreous to greasy, Crystal Structure: Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & Geological History

Usually forms in pegmatites or hydrothermal veins when natural radiation from surrounding rocks activates aluminum impurities in quartz crystals. It is found in geological environments ranging from thousands to millions of years old.

Uses & Applications

Used primarily for crystal healing, as a decorative specimen for collectors, and occasionally as a gemstone for jewelry when high clarity is present.

Geological Facts

The smoky color is the result of natural irradiation. It was historically used in China for the earliest known sunglasses during the 12th century.

Field Identification & Locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and translucent smoky appearance. Common in granite-heavy regions and pegmatite deposits worldwide.

Identified on: 4/13/2026

Mode: Standard