sedimentary

Asphalt aggregate pavement

Bituminous asphalt concrete containing crushed stone aggregate

AI-generated identification · may be incorrect

Dark gray to black, dull, fine-grained matrix with visible angular mineral grains; hardness is variable, generally about 2–6 Mohs for the asphalt–aggregate composite. It is noncrystalline, lacks cleavage, and commonly develops polygonal thermal and traffic cracks.

Identified August 22, 2026More sedimentary →

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Physical properties

Formation & geological history

This is a human-processed geological material: crushed rock aggregate bound with petroleum-derived bitumen and compacted as pavement, rather than a natural rock. The aggregate may include basalt, limestone, granite, or other local stone of varied geological ages.

Uses & applications

Used for roads, sidewalks, parking areas, and paving; it has no typical jewelry or collector value.

Geological facts

Green growth in the cracks is moss or algae, not a mineral feature. The lighter exposed patches likely reveal weathered aggregate or an older pavement layer.

Field identification & locations

Identify it by the black bituminous binder, mixed-size crushed grains, planar pavement surface, and engineered cracking; it should not be confused with natural basalt. Common worldwide in urban and transportation settings.