sedimentary

Weathered brown stone, likely sandstone or mudstone

Indeterminate clastic sedimentary rock; likely quartz-rich sandstone or lithified mudstone

AI-generated identification · may be incorrect

Brown-gray, fine to medium grained, dull to earthy luster, with apparent layering or foliation-like fractures. Estimated hardness 3–6 Mohs; cleavage absent, specific gravity approximately 2.3–2.7.

Identified August 22, 2026More sedimentary →

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At a glance

Common name: Weathered brown stone, likely sandstone or mudstone
Scientific name: Indeterminate clastic sedimentary rock; likely quartz-rich sandstone or lithified mudstone
Category: sedimentary
Identified: August 22, 2026
Method: Standard

AI Estimated Value

About $2–$15 for an ordinary hand specimen; $20–$75 if polished, fossiliferous, or accompanied by reliable locality information.

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 from compacted and cemented sediment, likely sand or silt, over millions to hundreds of millions of years; the exact age and depositional environment cannot be determined from the image.

Uses & applications

Common varieties are used as building stone, paving, landscaping material, aggregate, and occasionally decorative slabs. This specimen has modest collector value unless locality, unusual texture, or fossil content is confirmed.

Geological facts

The visible planar breaks may reflect bedding, weathering, or tectonic fracturing rather than true mineral cleavage. A fresh surface and acid, streak, and grain tests would improve identification.

Field identification & locations

Look for visible quartz grains and gritty texture for sandstone, or smooth earthy fracture and clay-rich feel for mudstone; dilute hydrochloric acid tests carbonate cement. Common worldwide in sedimentary basins.