sedimentary

Polished fossiliferous limestone

Bioclastic limestone, commonly fossil-rich micrite or wackestone

AI-generated identification · may be incorrect

Typically calcite-rich, Mohs hardness 3, dull to satin polish, gray-brown to black with cream fossil fragments and irregular calcite-filled pores. It has no consistent crystal cleavage at the hand-specimen scale and reacts vigorously with dilute hydrochloric acid.

Identified September 3, 2026More sedimentary →

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At a glance

Common name: Polished fossiliferous limestone
Scientific name: Bioclastic limestone, commonly fossil-rich micrite or wackestone
Category: sedimentary
Identified: September 3, 2026
Method: Standard

AI Estimated Value

About $20–$150 for a small polished specimen; architectural slabs commonly sell for roughly $50–$200+ per square meter, depending on rarity, finish, and provenance.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

A marine sedimentary rock formed from compacted carbonate mud and skeletal material, often during the Paleozoic or Mesozoic eras; exact age and locality cannot be determined from the image. Burial, cementation, and later polishing produced the visible slab finish.

Uses & applications

Used for decorative wall panels, furniture, flooring, countertops, monuments, and architectural veneer; fossil-rich varieties are also collected. It is less durable and acid-resistant than granite or quartzite.

Geological facts

The dark matrix and abundant fossil or shell-like cavities suggest a fossiliferous limestone rather than an igneous rock. Some commercial varieties may be marketed as “marble,” although geologically true marble is metamorphosed limestone.

Field identification & locations

Identify by visible fossils, calcite veins, relatively low hardness, and acid reaction; common sources include Italy, Turkey, Spain, China, and North America. Avoid vinegar or acid testing on finished surfaces unless damage is acceptable.