mineral

Red quartz crystal cluster (likely iron-stained quartz)

Quartz, silicon dioxide (SiO₂), with hematite/goethite staining or inclusions

AI-generated identification · may be incorrect

Typically Mohs hardness 7, vitreous to dull luster, white-to-reddish-brown color, and hexagonal crystal structure; quartz has no cleavage and conchoidal fracture. The crystals appear heavily coated or colored by iron oxides, possibly with a druzy coating.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Quartz precipitated from silica-rich hydrothermal fluids in fractures or cavities, with later oxidation depositing hematite or goethite. Exact age and locality cannot be determined from the image; such specimens occur in many mineralized veins and cavities.

Uses & applications

Collected primarily as a display mineral; quartz is widely used in glass, abrasives, electronics, and construction, while attractive clusters may be sold as décor or lapidary specimens.

Geological facts

The red color is commonly caused by microscopic hematite or iron-oxide films rather than red quartz itself. Strongly metallic-looking red coatings can sometimes indicate associated iron minerals.

Field identification & locations

Look for glassy fracture, very high scratch resistance, and possible hexagonal prism faces; it should not scratch easily with a steel knife. Common sources include Brazil, Morocco, Spain, and the southwestern United States.