man-made (synthetic rock)
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
Hardness: 1-3 (highly variable, softens with heat); Color: Charcoal gray to black; Luster: Dull to sub-metallic; Structure: Heterogeneous mixture of aggregates (stones/gravel) and a viscous binder (bitumen).
- Hardness
- 1-3 (highly variable, softens with heat)
- Color
- Charcoal gray to black
- Luster
- Dull to sub-metallic
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Physical properties
Hardness: 1-3 (highly variable, softens with heat); Color: Charcoal gray to black; Luster: Dull to sub-metallic; Structure: Heterogeneous mixture of aggregates (stones/gravel) and a viscous binder (bitumen).
Formation & geological history
Produced in industrial mixing plants where mineral aggregates (crushed rock, sand, gravel) are combined with liquid bitumen (petroleum-based). It mimic metamorphic textures through heat and pressure application during paving.
Uses & applications
Primary material for road construction, airport runways, parking lots, and roofing shingles. It is highly valued for its durability and flexibility.
Geological facts
Asphalt is the world's most recycled material. In the United States, nearly 100 million tons of asphalt pavement are reclaimed and reused every year.
Field identification & locations
Identify by its grainy, composite texture and dark color. It often has a distinct petroleum smell when freshly broken or heated. Common in urban environments; not a naturally occurring mineral specimen.
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