Smoky Quartz in Matrix

Physical Properties

Hardness: 7 (Mohs scale); Color: Brown to blackish-grey, translucent; Luster: Vitreous (glassy); Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & Geological History

Formed in igneous environments (pegmatites) or hydrothermal veins. The smoky color is caused by natural irradiation of aluminum-bearing quartz over millions of years.

Uses & Applications

Used primarily in jewelry (gemstones), ornamental carvings, and as popular collectable mineral specimens.

Geological Facts

Smoky quartz is the national gem of Scotland, where it is known as 'Cairngorm.' Some extremely dark specimens from the Alps are referred to as 'Morion.'

Field Identification & Locations

Identified by its smoky color, high hardness, and lack of cleavage. Look for it in granite-rich regions or alpine crevices.

Identified on: 4/14/2026

Mode: Standard