sedimentary

Weathered sandstone or iron-stained limestone fragment

Likely quartz-rich sandstone (SiO₂) or calcitic limestone (CaCO₃); exact identification requires testing

AI-generated identification · may be incorrect

Small tan, porous, granular fragment with dull earthy luster and apparent weathering. If sandstone, hardness is about 6–7 for quartz grains; if limestone, about 3 and it will fizz with dilute hydrochloric acid.

Identified August 11, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or iron-stained limestone fragment
Scientific name: Likely quartz-rich sandstone (SiO₂) or calcitic limestone (CaCO₃); exact identification requires testing
Category: sedimentary
Identified: August 11, 2026
Method: Standard

AI Estimated Value

Usually under $1 as an ordinary fragment; roughly $2–$10 if unusually colored, fossiliferous, or tied to a documented locality.

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

Sedimentary rock formed by deposition, compaction, and cementation of sand or carbonate mud, typically over millions to hundreds of millions of years. The orange-brown color likely comes from iron-oxide staining.

Uses & applications

Common sandstone and limestone are used for paving, walls, aggregate, cement, and architectural stone; this small weathered piece has little commercial value.

Geological facts

The image alone cannot reliably distinguish sandstone from limestone. A steel nail tests hardness, while a drop of vinegar or dilute acid tests for calcite fizzing.

Field identification & locations

Commonly found in sedimentary terrains and landscaping stone. Examine grain texture with magnification, try the acid test, and check whether individual quartz grains scratch glass.