sedimentary

Mixed gravelly conglomeratic road aggregate

Polymictic clast-supported conglomerate or fill; composition varies, commonly quartz, feldspar, basalt, and weathered rock fragments

AI-generated identification · may be incorrect

Hardness varies roughly 3–7 Mohs; gray-brown, poorly sorted, angular to subrounded clasts in a dusty granular matrix, with mostly dull to locally glassy lusters. No single crystal structure or cleavage is evident because this is a mixture rather than one mineral.

Identified August 23, 2026More sedimentary →

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At a glance

Common name: Mixed gravelly conglomeratic road aggregate
Scientific name: Polymictic clast-supported conglomerate or fill; composition varies, commonly quartz, feldspar, basalt, and weathered rock fragments
Category: sedimentary
Identified: August 23, 2026
Method: Standard

AI Estimated Value

Approximately $0–$5 as an ordinary loose aggregate sample; attractive individual clasts may be worth $1–$20.

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

Likely human-placed crushed aggregate or weathered conglomeratic sediment, not an identifiable single bedrock specimen; clasts may derive from multiple geological ages and source rocks. Cementation, if natural, would occur through burial and mineral precipitation in a sedimentary basin.

Uses & applications

Used for roads, paths, drainage, and construction fill; as pictured it has little jewelry or collector value.

Geological facts

The visible mixture includes pale felsic fragments, dark volcanic-looking clasts, and translucent quartz-like grains. Surface context and poor sorting strongly favor aggregate or unconsolidated gravel over a discrete hand specimen.

Field identification & locations

Identify by its heterogeneous composition, dusty matrix, and mixed angular fragments; a hand lens and vinegar test may help distinguish carbonate pieces, while a magnet can test for iron-rich material. Common worldwide in road base, glacial deposits, stream gravels, and quarry products.