sedimentary

Weathered porous limestone (probable fossil-rich carbonate fragment)

Calcite-dominated carbonate rock; CaCO₃

AI-generated identification · may be incorrect

White to cream, dull-to-earthy luster, irregular porous surface with brown iron/soil staining; likely Mohs 3, with weak cleavage and specific gravity around 2.7. The rounded shape suggests weathering or transport rather than crystal growth.

Identified September 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from accumulated marine carbonate shells or lime mud, later lithified and weathered; exact age cannot be determined visually. The Ethiopian locality near 9.7°N, 40.5°E can plausibly contain limestone and carbonate gravels.

Uses & applications

Used for cement, lime, aggregate, building stone, and soil neutralization; attractive fossiliferous pieces may be collected, but this specimen has little commercial value.

Geological facts

The cavities may represent dissolved shell fragments, pores, or weathered inclusions rather than a specific fossil. Calcite should effervesce strongly when a drop of dilute hydrochloric acid or vinegar is applied to a fresh surface, though vinegar may react weakly.

Field identification & locations

Identify by its light color, low hardness, and acid fizz; it should scratch with a steel knife and usually will not scratch glass. A hand lens may reveal shell fragments or calcite grains; the image does not support a precise fossil identification.