sedimentary

Polished pale stone, likely limestone or quartzite pebble

Most consistent with micritic limestone (calcite, CaCO₃), though the image cannot confirm mineralogy

AI-generated identification · may be incorrect

Smooth, rounded, matte-to-waxy surface; cream-white with gray mottling and possible weathering stains. Limestone has Mohs hardness 3 and fizzes with dilute hydrochloric acid; quartzite is harder (about 7) and does not fizz.

Identified August 10, 2026More sedimentary →

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At a glance

Common name: Polished pale stone, likely limestone or quartzite pebble
Scientific name: Most consistent with micritic limestone (calcite, CaCO₃), though the image cannot confirm mineralogy
Category: sedimentary
Identified: August 10, 2026
Method: Standard

AI Estimated Value

Typically $1-$10 as a common polished or decorative pebble; little collector premium without confirmed locality or unusual composition.

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 a naturally water-rounded river or beach pebble, possibly later tumbled or polished. Limestone commonly forms from compacted carbonate mud or marine organisms, generally in marine sedimentary environments of varying geological ages.

Uses & applications

Decorative pebble, craft material, paperweight, or garden stone; limestone is used for cement, aggregate, and soil neutralization, while quartzite is used as durable aggregate and facing stone.

Geological facts

The dark patches may be impurities, iron/manganese staining, or surface residue rather than distinct crystals. A scratch test and acid test are needed for reliable identification.

Field identification & locations

Test an inconspicuous area: calcite scratches with a steel knife and effervesces in acid; quartzite resists scratching and shows a glassy granular fracture. Common sources include limestone rivers, beaches, and gravel deposits worldwide.