sedimentary

Polished fossiliferous limestone

Bioclastic limestone, commonly called fossil limestone or marble-like limestone

AI-generated identification · may be incorrect

Mostly calcite (CaCO₃), with visible shell or fossil fragments and pale veins; hardness 3 Mohs, dull to satin luster, fine-grained crystalline matrix, and excellent polish. It commonly reacts vigorously with dilute hydrochloric acid.

Identified September 14, 2026More sedimentary →

Explore Polished fossiliferous limestone in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed from compacted and cemented marine shells, skeletal debris, and carbonate mud, likely during a Paleozoic–Mesozoic marine interval; later burial and lithification produced the solid rock. The rounded shape and glossy surface indicate tumbling or polishing.

Uses & applications

Used as a decorative stone, paper or cement-grade carbonate, aggregate, and ornamental lapidary material; attractive pieces may be sold as display specimens or cabochons.

Geological facts

The apparent white curved marks are likely fossil fragments, veins, or filled fractures rather than mineral crystals. It is sedimentary limestone, not true marble, unless substantial recrystallization has occurred.

Field identification & locations

Identify it by abundant fossil textures, carbonate reaction, low hardness, and lack of glassy conchoidal fracture; common sources include marine carbonate basins worldwide. Avoid prolonged acid exposure, which etches the polish.