sedimentary

Weathered shale or mudstone fragment

Fine-grained clastic sedimentary rock, likely shale or mudstone; exact identification is uncertain from the photo

AI-generated identification · may be incorrect

Tan to gray-brown, dull and earthy, with thin irregular layers and fractures. Likely composed mainly of clay minerals and silt-sized quartz; hardness and cleavage cannot be confirmed visually.

Identified September 26, 2026More sedimentary →

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At a glance

Common name: Weathered shale or mudstone fragment
Scientific name: Fine-grained clastic sedimentary rock, likely shale or mudstone; exact identification is uncertain from the photo
Category: sedimentary
Identified: September 26, 2026
Method: Standard

AI Estimated Value

About $0–$5 for an unprovenanced fragment; more only if it has a notable fossil or documented provenance.

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

Tan to gray-brown, dull and earthy, with thin irregular layers and fractures. Likely composed mainly of clay minerals and silt-sized quartz; hardness and cleavage cannot be confirmed visually.

Formation & geological history

Formed by compaction and cementation of fine mud in a low-energy setting, such as a lake, floodplain, or marine basin. Its age and source cannot be determined from the image.

Uses & applications

Ordinary fragments have little commercial value; shale and mudstone are used in cement, bricks, and other building materials where suitable.

Geological facts

Fine-grained sedimentary rocks can split along bedding planes, though weathering often makes fragments crumbly and irregular.

Field identification & locations

The layered, earthy appearance is consistent with weathered shale or mudstone, but a fresh surface and close inspection are needed to distinguish them. These rocks occur widely in sedimentary basins worldwide.