igneous, sedimentary, metamorphic

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

AI-generated identification · may be incorrect

Mostly rounded, water-worn pebbles with varied colors, grain sizes, and lusters; hardness likely about Mohs 3–7, depending on composition. No single crystal structure, cleavage, or specific gravity applies to the mixed collection.

Identified August 11, 2026More igneous, sedimentary, metamorphic →

Explore Mixed river stones and gravel 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: Mixed river stones and gravel
Scientific name: Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate
Category: igneous, sedimentary, metamorphic
Identified: August 11, 2026
Method: Standard

AI Estimated Value

About $0–$10 for the entire ordinary collection; distinctive, attractive, or unusually colored specimens may be worth $1–$20 each.

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

These are likely naturally weathered and transported alluvial gravels, deposited by a stream or river during the Quaternary Period. Their rounded shapes formed through abrasion during transport.

Uses & applications

Used for landscaping, drainage, garden decoration, crafts, educational collections, and occasionally polished stone products; individual specimens have little commercial value.

Geological facts

The assortment visibly contains several rock types, including dark fine-grained volcanic-looking stones, pale quartz-rich pieces, reddish sedimentary or metamorphic clasts, and possibly limestone.

Field identification & locations

Identify individual pieces by testing hardness, streak, acid reaction, grain texture, and magnetism; rounded edges indicate fluvial transport. Common worldwide in riverbeds, beaches, and gravel deposits.