sedimentary

Rounded pale river pebble, likely chert or quartz-rich stone

Most likely microcrystalline silica (chert, SiO₂) or fine-grained quartzite; identification is uncertain from the photograph

AI-generated identification · may be incorrect

Smooth, oval, pale gray-white, opaque to slightly translucent, with a dull-to-waxy luster and no visible crystals or cleavage. Estimated hardness is about Mohs 6.5–7; specific gravity roughly 2.6.

Identified September 20, 2026More sedimentary →

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At a glance

Common name: Rounded pale river pebble, likely chert or quartz-rich stone
Scientific name: Most likely microcrystalline silica (chert, SiO₂) or fine-grained quartzite; identification is uncertain from the photograph
Category: sedimentary
Identified: September 20, 2026
Method: Standard

AI Estimated Value

Typically $0.10–$3 for an ordinary pebble; approximately $5–$20 if unusually translucent, patterned, or polished.

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

Smooth, oval, pale gray-white, opaque to slightly translucent, with a dull-to-waxy luster and no visible crystals or cleavage. Estimated hardness is about Mohs 6.5–7; specific gravity roughly 2.6.

Formation & geological history

Likely rounded by stream or beach abrasion from a silica-rich source rock. Such pebbles may be geologically old, but the pebble shape records later transport and weathering; age cannot be determined visually.

Uses & applications

Suitable as a decorative pebble, craft material, landscaping stone, or possible lapidary rough. It has little commercial value unless cutting reveals attractive patterning or translucence.

Geological facts

The uniformly smooth surface strongly indicates natural water abrasion or tumbling. It could also be a polished quartzite or chalcedony pebble, but it does not show diagnostic banding or crystal faces.

Field identification & locations

Near 6.4°N, 125.6°E in Mindanao, stream-rounded silica-rich pebbles are plausible. Test with a steel knife or glass: quartz-rich material should scratch glass and resist a knife; a streak test and close inspection of a broken edge would help distinguish chert, quartzite, and chalcedony.