mineral

Iron-stained quartz-rich rock

Quartz (SiO₂), likely with iron-oxide staining; exact rock type is uncertain from the image

AI-generated identification · may be incorrect

Rough, mottled white, gray, and rusty brown; quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure, with no cleavage and conchoidal fracture. Brown coloration is consistent with iron oxides such as hematite or goethite.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

Likely a quartz-rich vein or rock fragment stained by iron-bearing fluids during weathering; its age and precise formation setting cannot be determined from the photo.

Uses & applications

Quartz is used in glass, electronics, abrasives, and decorative stone; this small unpolished piece is mainly suitable for collecting.

Geological facts

Iron oxides commonly coat or stain quartz, producing red, orange, or brown patches without changing the quartz itself.

Field identification & locations

Look for glassy or waxy quartz areas that scratch glass and resist scratching by a steel knife; rusty coating alone does not identify the host rock. Quartz-rich material occurs worldwide, especially in veins and weathered outcrops.