sedimentary

Brecciated stone, likely brecciated limestone or marble

Carbonate breccia; chiefly calcite (CaCO₃), with possible dolomite and dark matrix minerals

AI-generated identification · may be incorrect

Gray, rounded and polished, with angular pale carbonate fragments in a dark cemented network; calcite has Mohs hardness 3, vitreous to dull luster, rhombohedral cleavage, and specific gravity about 2.7. Exact identification requires an acid test and examination of a fresh surface.

Identified September 7, 2026More sedimentary →

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At a glance

Common name: Brecciated stone, likely brecciated limestone or marble
Scientific name: Carbonate breccia; chiefly calcite (CaCO₃), with possible dolomite and dark matrix minerals
Category: sedimentary
Identified: September 7, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a common palm-sized polished specimen; $30–$100+ for unusually attractive patterns or professionally cut material.

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

Formed when carbonate rock fragments were broken, transported or fault-crushed, then cemented by later calcite-rich fluids; age is uncertain from the image and depends on its source formation.

Uses & applications

Used as decorative stone, lapidary material, cabochons, and occasionally architectural facing; its contrasting breccia pattern makes it attractive for polished specimens.

Geological facts

The dark veins may represent calcite-filled fractures containing iron or manganese oxides, clay, or other minerals; some commercial pieces may be sold as brecciated marble or jasper despite being carbonate-rich.

Field identification & locations

Look for fizzing with dilute hydrochloric acid or vinegar on an inconspicuous spot, relatively low hardness, and pale powder; a streak or scratch test can distinguish it from silica-rich jasper, which is harder. Common sources include carbonate fault zones and brecciated limestone deposits worldwide.