sedimentary

Likely quartz-rich pebble in sandstone

Quartz clast (SiO₂) embedded in fine-grained sandstone; exact identification is uncertain from the image alone

AI-generated identification · may be incorrect

The host rock is gray, fine-grained sandstone with visible sand-sized grains; the pale, irregular clast may be quartz or a light-colored lithic fragment. Quartz has Mohs hardness 7 and a vitreous luster; the sandstone’s hardness and composition vary with cement.

Identified October 3, 2026More sedimentary →

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At a glance

Common name: Likely quartz-rich pebble in sandstone
Scientific name: Quartz clast (SiO₂) embedded in fine-grained sandstone; exact identification is uncertain from the image alone
Category: sedimentary
Identified: October 3, 2026
Method: Standard

AI Estimated Value

Usually under $5 for an ordinary loose specimen; value depends on size, locality, and whether the pale feature proves to be a notable fossil or mineral.

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

Sand-sized grains were deposited and cemented into sandstone; the larger clast was incorporated during deposition or later erosion and exposure. The image does not establish geological age or precise setting.

Uses & applications

Sandstone is used as building and paving stone and as a source of aggregate; quartz pebbles are collected and sometimes used decoratively.

Geological facts

The conspicuous pale feature could also be a fossil or a weathered inclusion; a closer view and tests would be needed to distinguish them.

Field identification & locations

Look for distinct sand grains and layering in the host rock, and check whether the pale clast differs in hardness or texture. Sandstone occurs widely in sedimentary basins worldwide.