mineral

Iron-stained quartz-rich rock

Milky quartz with limonite/goethite staining; possibly quartzite or silicified rock

AI-generated identification · may be incorrect

Predominantly white to translucent, massive quartz with dull to vitreous luster and rusty yellow-brown iron-oxide coatings. Quartz hardness is Mohs 7, no cleavage, conchoidal fracture, and specific gravity about 2.65; the specimen appears granular and weathered.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich fluids precipitated quartz in a vein or cemented a quartz-rich host rock, with later oxidation producing limonite/goethite staining. Exact geological age and host environment cannot be determined from the photograph.

Uses & applications

Common quartz-rich material has little commercial value as-is, but quartz is important in glass, ceramics, electronics, abrasives, and engineered stone; attractive pieces may be used as display specimens.

Geological facts

The yellow-brown coloration is typically hydrated iron oxides rather than gold. A steel file should not scratch fresh quartz, while quartz can scratch ordinary glass.

Field identification & locations

Common in hydrothermal veins, weathered quartz veins, and quartzite outcrops worldwide. Confirm with a hardness test, streak test on unglazed porcelain, and close inspection for distinct crystals or metallic gold.