mineral

Iron-stained quartz vein

Quartz (SiO₂) with iron-oxide/hydroxide staining, likely limonite/goethite

AI-generated identification · may be incorrect

Mostly white to translucent, massive quartz with rusty brown surface staining; vitreous to dull luster, Mohs hardness 7, trigonal crystal structure, no cleavage and conchoidal fracture. The image shows an outcrop rather than a clean specimen, so exact mineral identification is limited.

Identified October 9, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly precipitates from silica-rich hydrothermal fluids in fractures; later weathering oxidizes iron-bearing minerals and leaves brown stains. The age depends on the host rock and cannot be determined from the image.

Uses & applications

Quartz is used in glass, engineered stone, electronics, and collecting; this iron-stained vein material is generally of modest decorative or specimen value.

Geological facts

Iron oxides can coat or permeate quartz, producing rusty colors without changing quartz’s hardness. Quartz veins commonly mark former fluid pathways in bedrock.

Field identification & locations

Look for hard, glassy white material that scratches glass and breaks with curved surfaces; rusty staining suggests iron oxides. Quartz veins occur worldwide in igneous, metamorphic, and sedimentary terrains.