mineral

Iron-stained quartz with dark mineral inclusions

Quartz (SiO₂), with iron oxides and likely dark mica or other inclusions

AI-generated identification · may be incorrect

Appears translucent to opaque, with rusty brown and gray-black patches and a vitreous-to-dull luster. Quartz hardness is 7 on the Mohs scale, has a trigonal crystal structure, and lacks cleavage; the specimen’s exact properties cannot be confirmed from the image.

Identified October 15, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes in veins and cavities as silica-rich fluids cool; iron oxides can stain it, while darker minerals may become enclosed during growth. The specimen’s age and precise geological setting cannot be determined visually.

Uses & applications

Quartz is used in glass, electronics, abrasives, and ornaments; attractive pieces may be kept as natural-history or mineral-collection specimens.

Geological facts

Iron-rich coatings and inclusions can give quartz irregular rusty colors, but the pictured specimen is not distinctive enough to identify a specific quartz variety.

Field identification & locations

Look for glassy fracture surfaces and hardness near 7; quartz will scratch glass, though testing could damage the specimen. Quartz occurs worldwide in veins and many igneous and metamorphic rocks.