sedimentary

Likely tumbled sandstone or limestone

Quartz-rich sandstone (possibly calcarenite/limestone)

AI-generated identification · may be incorrect

Pale cream, fine-grained, matte and weakly porous with rounded edges from abrasion; likely Mohs 3–7 depending on composition. No visible crystals or cleavage; the faint central discoloration may be iron staining or a fossil/texture remnant.

Identified August 10, 2026More sedimentary →

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Physical properties

Formation & geological history

A sedimentary fragment formed from cemented sand-sized quartz and/or carbonate grains, then naturally or artificially rounded and smoothed. The specimen’s geological age cannot be determined from the photograph.

Uses & applications

Common sandstone is used in construction, paving, and decorative stone; limestone is used for cement, aggregate, and architectural stone. This small piece has little commercial or collector value unless it proves to be a fossil-bearing or unusual material.

Geological facts

The powdery, uniformly granular surface is more consistent with sandstone or soft limestone than with a crystalline mineral. A drop of dilute vinegar will fizz on calcite-rich limestone but not on quartz-rich sandstone.

Field identification & locations

Field identification requires a close-grained examination, streak, hardness, and acid test: quartz-rich sandstone scratches glass, whereas limestone is scratched by steel and may fizz in acid. Common worldwide; likely worth $1–$10 as a tumbled/common specimen, or more if fossiliferous.