sedimentary

Fossiliferous limestone fragment

Limestone, chiefly calcite (CaCO₃), possibly containing shell or coral fossil material

AI-generated identification · may be incorrect

Typically white, cream, tan, and gray with earthy to dull luster; Mohs hardness 3, poor cleavage, and irregular fracture. The layered, angular fragment appears natural but may have been cut or broken from a slab.

Identified August 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms from compacted carbonate mud, shells, or reef debris in shallow marine environments, commonly during Paleozoic–Cenozoic sedimentation. The visible banding and contrasting pale material suggest fossil-bearing or laminated carbonate rock.

Uses & applications

Used for building stone, aggregate, cement, lime, and decorative slabs; attractive fossiliferous pieces are collected or used in displays. This small fragment has little commercial value.

Geological facts

Calcite-rich limestone effervesces vigorously with dilute hydrochloric acid or household vinegar, especially on a freshly broken surface. Fossils may appear as shell outlines, porous coral textures, or mineral-filled cavities.

Field identification & locations

Common worldwide, including the United States, Europe, and many former shallow-sea basins. Identify it by its softness, carbonate reaction, and sedimentary layering; distinguish it from marble by its obvious bedding and lack of recrystallized texture.