mineral

Weathered, iron-stained quartz-rich rock

Likely quartzite or massive quartz (SiO₂), possibly with limonite/goethite staining

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale gray to tan-brown, earthy surface, dull to weakly glassy luster, and no obvious cleavage. The rounded shape and rough texture indicate natural weathering and abrasion.

Identified September 16, 2026More mineral →

Explore Weathered, iron-stained quartz-rich rock in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Weathered, iron-stained quartz-rich rock
Scientific name: Likely quartzite or massive quartz (SiO₂), possibly with limonite/goethite staining
Category: mineral
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Typically $1-$10 as an ordinary specimen; potentially $10-$30 if it has unusually clear quartz, attractive coloring, or a documented locality.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Hardness about 7 Mohs; pale gray to tan-brown, earthy surface, dull to weakly glassy luster, and no obvious cleavage. The rounded shape and rough texture indicate natural weathering and abrasion.

Formation & geological history

Probably formed from quartz-rich metamorphic or hydrothermal material, then exposed and weathered over a long geological period; its exact age cannot be determined from the photograph.

Uses & applications

Common quartzite is used as aggregate, road stone, building stone, and occasionally as a decorative specimen; attractive quartz pieces may be collected but are generally low value.

Geological facts

Iron oxides commonly produce the tan, brown, and yellow staining seen on otherwise pale quartz-rich rocks.

Field identification & locations

A glass-scratch test can support quartz identification: quartz should scratch ordinary glass, though testing may damage the specimen. Common sources include stream gravels, weathered outcrops, and quartz veins worldwide.