sedimentary

Weathered limestone

Calcitic limestone, mainly calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Pale cream to tan, dull earthy luster, fine-grained and massive, with irregular brown/gray weathering veins or staining. Calcite hardness is about Mohs 3; it commonly effervesces strongly with dilute hydrochloric acid or vinegar, though weathered surfaces may react weakly.

Identified August 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely marine or freshwater carbonate sediment lithified into limestone, then rounded and weathered. The photograph cannot establish a precise age; limestone is widespread in the Cretaceous and younger sedimentary terrains near 17.2°N, 89.1°W (northern Guatemala/Belize region).

Uses & applications

Used for aggregate, cement and lime, building stone, soil neutralization, and decorative stone. This rounded specimen has little commercial or jewelry value.

Geological facts

Brown markings are probably iron-oxide or manganese staining, clay, or fossil-related structures rather than crystalline mineral bands. It may contain microscopic fossils that are not resolvable in the image.

Field identification & locations

Identify it by its light color, relatively soft surface, sedimentary texture, and acid reaction; a steel nail may scratch it. Common in karst landscapes and river gravels of the Maya-region carbonate platform. A close-up of broken or polished surfaces could reveal fossils or dolomite.