sedimentary

Weathered, iron-stained rock (likely sandstone or breccia)

Indeterminate clastic sedimentary rock; possible ferruginous sandstone or weathered breccia

AI-generated identification · may be incorrect

Tan to reddish-brown, dull to earthy luster, irregular granular texture, and apparent rounded clasts or cavities. Estimated hardness 5–7 Mohs; cleavage absent and specific gravity likely about 2.3–2.7, though exact identification requires a fresh surface, hand lens, and tests.

Identified September 6, 2026More sedimentary →

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At a glance

Common name: Weathered, iron-stained rock (likely sandstone or breccia)
Scientific name: Indeterminate clastic sedimentary rock; possible ferruginous sandstone or weathered breccia
Category: sedimentary
Identified: September 6, 2026
Method: Standard

AI Estimated Value

$0–$15 as an ordinary unidentified specimen; more if a confirmed unusual breccia, fossil-bearing rock, or attractive polished material.

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 deposition and cementation of sand or rock fragments, followed by oxidation that produced the brown iron staining; age cannot be determined from the photograph. It may also be a weathered metamorphic or igneous fragment.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and landscaping; this hand specimen has mainly educational or modest collector value.

Geological facts

The dark patches may be iron-oxide concretions, mafic mineral grains, or weathered inclusions rather than fossils. The image does not show diagnostic crystals or layering clearly enough for a precise name.

Field identification & locations

Inspect grain size and layering, test streak and hardness, and apply dilute hydrochloric acid to a fresh surface for carbonate cement. Likely occurrences include sedimentary basins and weathered outcrops worldwide.