sedimentary

Weathered iron-rich sandstone or ferruginous conglomerate

Quartz-rich sandstone cemented by iron oxides/hydroxides (primarily hematite and goethite)

AI-generated identification · may be incorrect

Brown to reddish-brown, earthy to dull luster, visibly granular with rounded quartz-like grains and iron-stained cement; likely Mohs hardness 5–7, with no obvious cleavage. The irregular cavity may be natural weathering or a broken vesicle-like void.

Identified September 8, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich sandstone or ferruginous conglomerate
Scientific name: Quartz-rich sandstone cemented by iron oxides/hydroxides (primarily hematite and goethite)
Category: sedimentary
Identified: September 8, 2026
Method: Standard

AI Estimated Value

Typically $2–$15 for an ordinary hand specimen; approximately $20–$50 if unusually attractive, polished, or locality-documented.

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

Formed when sand-sized quartz and rock fragments were deposited, compacted, and cemented by silica and iron minerals; later oxidation produced the rusty color. Its exact geological age cannot be determined from the image.

Uses & applications

Mostly a common geological specimen or lapidary material; occasionally used as decorative stone, aggregate, or a source of iron-rich pigment, but it has little gemstone value.

Geological facts

The specimen resembles ferruginous sandstone more than a crystal-bearing ore or meteorite; rusty colors commonly reflect hematite/goethite coatings rather than metallic iron.

Field identification & locations

Common in continental sedimentary formations, desert surfaces, and weathered iron-rich terrains worldwide. Field tests include a gritty texture, visible grains, reddish-brown streak or powder, and possible fizz-free reaction to dilute acid; a hardness test helps distinguish it from softer limonite-rich material.