sedimentary

Perforated beach pebble (likely sandstone or chert)

Indeterminate siliciclastic sedimentary rock; predominantly quartz (SiO₂), possibly calcareous cement

AI-generated identification · may be incorrect

Smooth, water-worn brown pebble with matte to faintly silky luster and a natural rounded cavity/taphole; likely hardness about 5–7 Mohs, noncleaving, fine-grained, with variable porosity and specific gravity around 2.3–2.7.

Identified September 12, 2026More sedimentary →

Explore Perforated beach pebble (likely sandstone or chert) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Perforated beach pebble (likely sandstone or chert)
Scientific name: Indeterminate siliciclastic sedimentary rock; predominantly quartz (SiO₂), possibly calcareous cement
Category: sedimentary
Identified: September 12, 2026
Method: Standard

AI Estimated Value

Typically $2–$20; unusually attractive, large, or demonstrably natural examples may sell for about $20–$50.

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 from lithified sand or silica-rich sediment, then rounded by abrasion in a river, beach, or surf zone; the cavity may reflect differential erosion around a softer inclusion or dissolved shell/clast. Exact geological age cannot be determined from the image.

Uses & applications

Primarily a decorative or collectible curiosity; similar stone is used as aggregate, landscaping material, and occasionally ornamental stone, but this individual has little commercial utility.

Geological facts

The hole appears naturally eroded rather than drilled, making it a “hag stone” or “witch stone,” a traditional folklore name for naturally holed pebbles.

Field identification & locations

Look for quartz grains or conchoidal fracture for identification; acid fizz would indicate carbonate cement or limestone. Common along rocky coasts and gravel bars worldwide.