mineral

Weathered iron-rich rock, possibly limonite-bearing quartzite or altered basalt

Indeterminate; likely quartz (SiO₂) with iron oxides/hydroxides such as limonite/goethite

AI-generated identification · may be incorrect

Hardness likely 5–7 overall; pale gray to tan-brown, dull to earthy luster, granular and highly porous/weathered, with no clearly visible crystal faces or cleavage. The metallic-looking yellow-brown areas may be iron staining rather than native metal.

Identified August 26, 2026More mineral →

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At a glance

Common name: Weathered iron-rich rock, possibly limonite-bearing quartzite or altered basalt
Scientific name: Indeterminate; likely quartz (SiO₂) with iron oxides/hydroxides such as limonite/goethite
Category: mineral
Identified: August 26, 2026
Method: Standard

AI Estimated Value

Typically $1–$15 as an unattributed specimen; more if chemical testing confirms an unusual ore or meteorite.

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

Formation & geological history

Likely formed by weathering or hydrothermal alteration of a silicate-rich parent rock, with iron minerals precipitating during oxidation; exact age and protolith cannot be determined from the photograph.

Uses & applications

Typically a low-value hand specimen or field curiosity; iron-rich material may be used as pigment or iron ore when sufficiently concentrated, while quartz-rich rock can serve as aggregate.

Geological facts

The rough vesicular texture and rusty coloration are consistent with limonite/goethite coatings, but the image is insufficient for a confident species-level identification.

Field identification & locations

Test hardness against glass, inspect a fresh break, and use a streak test; a reddish-yellow streak suggests iron oxides, while a strong glass scratch suggests quartz. Common in weathered outcrops, gossans, and hydrothermal zones.