sedimentary

Weathered brown rock fragment

Indeterminate; possibly iron-stained sandstone, mudstone, or weathered limestone

AI-generated identification · may be incorrect

Appears tan-brown, dull, fine-grained, and irregularly rounded with possible lighter mineral patches. Hardness and cleavage cannot be determined reliably from the image; iron-oxide staining is likely.

Identified September 16, 2026More sedimentary →

Explore Weathered brown rock fragment 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 brown rock fragment
Scientific name: Indeterminate; possibly iron-stained sandstone, mudstone, or weathered limestone
Category: sedimentary
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Typically $0-$10 as an unidentified common fragment; potentially $10-$50 if laboratory testing reveals a distinctive fossil, mineralization, or 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

Formation & geological history

Likely formed as a sedimentary rock and later altered by weathering and oxidation; its geological age and exact environment cannot be established visually.

Uses & applications

Usually used only as a field specimen or landscaping material unless testing identifies a decorative stone, fossil-bearing layer, or useful aggregate.

Geological facts

The brown coloration may result from hematite or goethite coatings rather than the rock’s primary composition. Image resolution prevents confident mineral or fossil identification.

Field identification & locations

Common possibilities include weathered sandstone, siltstone, mudstone, or limestone; inspect grain size, acid reaction, streak, and scratch resistance, and look for visible quartz grains or bedding. Common worldwide.