sedimentary

Weathered quartz-rich stone, possibly fossiliferous limestone

Indeterminate; likely calcite-rich limestone (CaCO₃) or weathered quartz-bearing rock

AI-generated identification · may be incorrect

Small tan-gray, irregular specimen with dull to slightly waxy luster and strongly eroded, possibly fossil-like texture. If limestone, hardness is 3 and it fizzes with dilute hydrochloric acid; if quartz-rich, hardness is about 7 and it will not fizz.

Identified August 8, 2026More sedimentary →

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At a glance

Common name: Weathered quartz-rich stone, possibly fossiliferous limestone
Scientific name: Indeterminate; likely calcite-rich limestone (CaCO₃) or weathered quartz-bearing rock
Category: sedimentary
Identified: August 8, 2026
Method: Standard

AI Estimated Value

Generally $1–$10 as an unidentified stream specimen; more if confirmed as an attractive fossil or unusual concretion.

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 a naturally weathered stream or river specimen formed in sedimentary deposits; age and exact formation cannot be determined from the photograph. Its rounded, softened surface suggests prolonged water abrasion or chemical weathering.

Uses & applications

Primarily a curiosity or teaching specimen; limestone may be used for aggregate, cement, and agricultural lime, while quartz-rich material has little industrial value at this size.

Geological facts

The apparent sculpted form may be differential weathering around fossil material, a concretion, or simply an eroded fragment; the image is insufficient for confident species-level identification.

Field identification & locations

Test hardness with a steel nail and apply a drop of vinegar or dilute acid to a fresh surface; visible fizz supports calcite. Commonly encountered in stream gravels and exposed sedimentary terrains.