sedimentary

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

AI-generated identification · may be incorrect

Dark gray-black, dull to slightly vitreous aggregate in a bitumen matrix; hardness varies widely, commonly Mohs 2–7 for the mineral fragments. No coherent crystal structure or consistent cleavage as a whole; visible grains include likely quartz, feldspar, and dark lithic fragments.

Identified September 20, 2026More sedimentary →

Explore Asphalt aggregate in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

A human-processed road-surfacing material, not a naturally formed rock: crushed geological aggregate is bound with petroleum-derived bitumen and compacted. The underlying grains may originate from igneous, metamorphic, or sedimentary quarry rock of variable age.

Uses & applications

Used primarily for roads, parking areas, paths, and roofing; it has no normal jewelry or collector value.

Geological facts

The image shows a paved surface rather than an individual natural specimen. Light-colored angular grains and dark fragments are embedded in weathered asphalt, with possible organic debris on the surface.

Field identification & locations

Identify it by the continuous black binder, mixed angular aggregate, flattened compacted surface, and lack of natural bedding or consistent mineral texture. Common anywhere paved roads or lots occur.