sedimentary

Weathered limestone fragment

Limestone, predominantly calcite (CaCO₃), possibly fossiliferous or dolomitic

AI-generated identification · may be incorrect

Pale cream-gray, earthy to dull luster, irregular granular texture, and no obvious cleavage visible; calcite hardness is Mohs 3, with specific gravity about 2.7. It should fizz with dilute hydrochloric acid or strong vinegar if calcitic, though the image alone cannot confirm composition.

Identified August 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms from accumulated carbonate mud, shells, or chemical precipitation in shallow marine environments; many limestones formed during Paleozoic–Cenozoic seas, though the specimen’s age cannot be determined visually.

Uses & applications

Commonly used as crushed aggregate, cement and lime feedstock, building stone, and soil neutralizer; this small weathered piece has negligible commercial value.

Geological facts

Limestone commonly contains fossils, but none are clearly identifiable in this image. Weathering can produce the rough, rounded surface and yellow-brown staining visible here.

Field identification & locations

Identify it by its pale color, relatively soft surface, carbonate texture, and acid fizz; calcite may scratch it with a steel knife, while it should not scratch glass. Common worldwide, especially in former marine sedimentary basins.