sedimentary

Quartz-rich sandstone or quartzite pebble

Likely quartz arenite sandstone; possibly low-grade quartzite, composed mainly of SiO₂

AI-generated identification · may be incorrect

Pale brown-gray, fine-grained, dull to weakly glassy luster, with whitish veining and weathered surfaces. Quartz has Mohs hardness 7; sandstone is generally weaker and may show granular texture, while quartzite is very hard and scratches glass.

Identified September 17, 2026More sedimentary →

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At a glance

Common name: Quartz-rich sandstone or quartzite pebble
Scientific name: Likely quartz arenite sandstone; possibly low-grade quartzite, composed mainly of SiO₂
Category: sedimentary
Identified: September 17, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 as a common field specimen; $10–$30 if unusually attractive, polished, or confirmed as quality quartzite.

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

If sandstone, compacted and cemented quartz sand formed in an ancient sedimentary basin; if quartzite, later metamorphism recrystallized the sandstone. Exact age cannot be determined from the image.

Uses & applications

Commonly used as building stone, paving, aggregate, and decorative rock; attractive pieces may be collected or polished, but this specimen appears of modest commercial value.

Geological facts

The visible pale vein may be quartz cement or a later fracture-filling vein. A diagnostic distinction is whether grains break apart along boundaries (sandstone) or the entire specimen fractures through grains (quartzite).

Field identification & locations

Common in river gravels, beaches, road cuts, and sandstone or metamorphic terrains worldwide. Check with a hand lens, attempt a glass-scratch test, and apply dilute acid only if carbonate cement is suspected.