mineral

Smoky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Smoky brown to brownish-yellow due to iron staining; Luster: Vitreous; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Smoky brown to brownish-yellow due to iron staining
Luster: Vitreous

Identified June 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed in pegmatites, hydrothermal veins, and metamorphic rocks. The smoky color results from natural irradiation of aluminum-bearing quartz, while the orange-brown tint is due to iron oxide (limonite) surface staining or inclusions.

Uses & applications

Used primarily for gemstone jewelry, ornamental carvings, and as a popular collector's mineral specimen. In industry, high-purity quartz is used in electronics and glass-making.

Geological facts

This specimen is a 'doubly terminated' crystal, meaning it grew naturally without being attached to a matrix at either end. Quartz is one of the most abundant minerals in Earth's crust.

Field identification & locations

Identify by its hexagonal prism shape and its ability to scratch glass. Commonly found in Brazil, Madagascar, and the USA (Colorado and Arkansas). Collectors look for clarity and natural termination points.

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