metamorphic

Weathered iron-rich rock, possibly limonite-bearing quartzite or ironstone

Limonite/goethite-rich Fe-oxide rock; exact identification requires testing

AI-generated identification · may be incorrect

Brown-gold, dull to slightly earthy luster, granular and heavily weathered with possible quartz or mica-like reflective surfaces; hardness roughly 4–7 depending on composition, no obvious cleavage, and moderate-to-high specific gravity if iron-rich.

Identified September 6, 2026More metamorphic →

Explore Weathered iron-rich rock, possibly limonite-bearing quartzite or ironstone 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-rich rock, possibly limonite-bearing quartzite or ironstone
Scientific name: Limonite/goethite-rich Fe-oxide rock; exact identification requires testing
Category: metamorphic
Identified: September 6, 2026
Method: Standard

AI Estimated Value

About $1–$15 for an ordinary hand specimen; roughly $20–$75 if unusually attractive, heavy, crystalline, or locality-labeled.

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 oxidation and weathering of iron-bearing minerals, or metamorphism/cementation of silica-rich sediment; age and precise formation environment cannot be determined from the photograph.

Uses & applications

Common ironstone has limited commercial value but may be used as iron ore or aggregate; attractive pieces are collected as cabinet specimens. It is not suitable for jewelry without cutting and stability testing.

Geological facts

The yellow-brown coloration commonly comes from goethite and limonite, while metallic-looking glints may reflect quartz, mica, or iron-oxide coatings rather than native metal.

Field identification & locations

Check for a reddish-brown to yellow streak, magnetic response, hardness, and acid reaction; a glassy fracture and strong scratch resistance would support quartzite. Common in weathered iron-oxide zones worldwide.