sedimentary

Likely calcite-rich limestone or marble fragment

Calcite (CaCO₃), probably micritic limestone; exact identification requires testing

AI-generated identification · may be incorrect

Pale cream to white, dull-to-waxy luster, massive fine-grained texture with irregular fracture and possible faint layering. Calcite has Mohs hardness 3, perfect rhombohedral cleavage, and specific gravity about 2.7; it should effervesce with dilute hydrochloric acid or vinegar (less reliably).

Identified August 21, 2026More sedimentary →

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At a glance

Common name: Likely calcite-rich limestone or marble fragment
Scientific name: Calcite (CaCO₃), probably micritic limestone; exact identification requires testing
Category: sedimentary
Identified: August 21, 2026
Method: Standard

AI Estimated Value

About $1–$10 as an unclassified common fragment; higher only if fossiliferous, unusually patterned, or confirmed as quality marble.

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

Likely formed from compacted carbonate mud or accumulated marine skeletal material; if recrystallized, it may instead be marble, a metamorphic rock. Carbonate rocks commonly range from Paleozoic to recent geological ages.

Uses & applications

Used for cement, lime, aggregate, dimension stone, soil amendment, and carving; attractive polished pieces may be used decoratively, but this specimen appears low-grade.

Geological facts

The visible fibrous or swirled texture may reflect fossil fragments, recrystallized calcite, or weathering rather than a diagnostic mineral pattern.

Field identification & locations

Common in marine sedimentary basins and limestone quarries worldwide. Confirm with a fresh-surface acid test, hardness test against a steel nail, and examination for fossils or crystalline grains.