mineral

Iron-stained quartz-rich rock

Likely quartz (SiO₂) with iron-oxide staining; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Rough, opaque tan-yellow specimen with pale patches and no obvious crystal faces. Quartz has Mohs hardness 7, a hexagonal crystal structure, vitreous luster when fresh, and no cleavage; iron oxides cause the rusty coloration.

Identified October 1, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms in veins and many rock types; iron-bearing fluids can stain it yellow-brown during weathering. The specimen’s age and specific formation environment cannot be determined from the image.

Uses & applications

Quartz is used in glassmaking, electronics, construction, and jewelry; this rough piece appears to have modest decorative or collecting use.

Geological facts

Iron oxides such as limonite commonly coat or stain quartz and other rocks, producing yellow, ochre, and brown colors.

Field identification & locations

A scratch test on an inconspicuous spot can help distinguish quartz: it should scratch ordinary glass. Quartz is widespread worldwide, but a fresh break or hardness test would be needed for confident identification.