sedimentary

Weathered brown stone, possibly mudstone or iron-stained limestone

Indeterminate sedimentary rock; likely clay-rich mudstone/shale or ferruginous limestone

AI-generated identification · may be incorrect

Hardness approximately 3–5 Mohs; dull earthy luster, brown-gray mottled color, fine-grained and irregularly fractured. No visible crystals, cleavage, or diagnostic fossils are resolvable from the image.

Identified August 23, 2026More sedimentary →

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At a glance

Common name: Weathered brown stone, possibly mudstone or iron-stained limestone
Scientific name: Indeterminate sedimentary rock; likely clay-rich mudstone/shale or ferruginous limestone
Category: sedimentary
Identified: August 23, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 as an unverified common specimen; a confirmed fossil-bearing or unusual locality specimen could be worth more.

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 from compacted sediment or carbonate mud and later weathered/oxidized near the surface; age and exact formation environment cannot be determined visually.

Uses & applications

Unlikely to have commercial value; comparable material is used as aggregate, fill, or occasionally dimension stone if sufficiently durable.

Geological facts

The rounded, darkened exterior is consistent with weathering and iron-oxide staining, but the photograph does not support a confident species-level identification.

Field identification & locations

Test hardness against a steel nail, inspect a fresh break for layering, and apply dilute hydrochloric acid: vigorous fizz suggests calcite-rich limestone, while no fizz favors mudstone/shale. Common worldwide in sedimentary terrains.