igneous

Road-surface aggregate (crushed stone)

Unidentifiable mixed lithic aggregate; likely basaltic/andesitic fragments with feldspar, quartz, and weathered rock

AI-generated identification · may be incorrect

Dark gray, fine-grained, angular gravel embedded in asphalt; individual grains likely have Mohs hardness about 5–7, dull to granular luster, and no visible cleavage at this scale.

Identified September 20, 2026More igneous →

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At a glance

Common name: Road-surface aggregate (crushed stone)
Scientific name: Unidentifiable mixed lithic aggregate; likely basaltic/andesitic fragments with feldspar, quartz, and weathered rock
Category: igneous
Identified: September 20, 2026
Method: Standard

AI Estimated Value

$0–$1 for incidental grains; bulk aggregate typically costs roughly $10–$50 per ton, depending on locality.

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

Dark gray, fine-grained, angular gravel embedded in asphalt; individual grains likely have Mohs hardness about 5–7, dull to granular luster, and no visible cleavage at this scale.

Formation & geological history

Human-processed geological material quarried, crushed, and mixed into pavement; aggregate may derive from volcanic or metamorphic bedrock of varied geological ages.

Uses & applications

Used as road base and asphalt aggregate for transportation infrastructure; not generally used for jewelry or collecting.

Geological facts

The image shows pavement aggregate rather than a discrete identifiable specimen. Asphalt is a manufactured binder containing mineral aggregate and is not itself a natural rock.

Field identification & locations

Identify individual grains by color, texture, acid reaction, and hardness after extraction; a laboratory or close-up sample is needed for precise classification. Common worldwide near roads and quarries.