mineral

Smoky Quartz with Hematite inclusions

Silicon Dioxide (SiO2) with Fe2O3 inclusions

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale. Color: Brownish-gray, smoky, with reddish-brown splotches. Luster: Vitreous (glassy). Crystal Structure: Trigonal. Cleavage: Indistinct/Conchoidal. Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Brownish-gray, smoky, with reddish-brown splotches
Luster: Vitreous (glassy)

Identified May 21, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale. Color: Brownish-gray, smoky, with reddish-brown splotches. Luster: Vitreous (glassy). Crystal Structure: Trigonal. Cleavage: Indistinct/Conchoidal. Specific Gravity: 2.65.

Formation & geological history

Formed in igneous or metamorphic environments, primarily in pegmatites through the natural irradiation of aluminum-bearing quartz, while hematite inclusions occurred during late-stage hydrothermal deposition.

Uses & applications

Used primarily in lapidary arts, jewelry, and as a collector's specimen. In industry, high-purity quartz is used in electronics and glass manufacturing.

Geological facts

The 'smoky' color comes from exposure to natural radioactive sources in the surrounding rock, which causes color centers to form around aluminum impurities within the crystal lattice.

Field identification & locations

Identify by its hardness (scratches glass), lack of distinct cleavage, and characteristic brownish-translucent color. Red spots indicate iron oxide (hematite) inclusions within the host quartz.