sedimentary

Weathered limestone fragment

Calcite-rich limestone (predominantly CaCO₃)

AI-generated identification · may be incorrect

Light tan, porous, earthy to dull luster, with irregular layered or fossil-like textures; calcite hardness is Mohs 3, with poor-to-indistinct cleavage in the rock. It should fizz with dilute hydrochloric acid or strong vinegar if fresh calcite is exposed.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed by accumulation and cementation of carbonate mud, shells, or skeletal debris in marine or freshwater environments; age cannot be determined from the photograph. Surface weathering and abrasion likely produced its rounded shape and rough texture.

Uses & applications

Used as crushed stone, aggregate, cement and lime feedstock, and dimension stone; attractive pieces may be collected but this specimen has little gem value.

Geological facts

Limestone commonly preserves fossils and can develop caves, sinkholes, and karst landscapes when dissolved by acidic groundwater.

Field identification & locations

Common worldwide, especially in former shallow-sea deposits. Identify it by its pale color, relatively low hardness, sedimentary texture, and acid reaction; distinguish it from quartz by its softness and fizzing.