Where is Asphalt Concrete found?
Bituminous Macadam
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Open the appAsphalt Concrete occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Asphalt Concrete
Roads and Highways
Ubiquitous globally as the primary paving material for transportation infrastructure.
Parking Lots
Commonly used for surfacing commercial and residential parking areas.
Airport Runways
Extensively used for aircraft runways, taxiways, and aprons due to its flexibility and durability.
Industrial Pavements
Found in industrial facilities, loading docks, and storage yards.
Collecting tips
- Look for Paved Surfaces. Asphalt concrete is exclusively found as a constructed surface. Look for dark, granular pavements.
- Observe Aggregate. Examine the surface for visible aggregate particles (stones, gravel, sand) embedded in a dark, tar-like matrix.
- Consider Context. Its presence always indicates human construction and engineering, never a natural geological outcrop.
Quick Check
- Color:
- Dark black to dark gray
- Luster:
- Dull to greasy/waxy
- Streak:
- Black to dark brown (if a streak can be obtained, which is difficult due to its composite nature)
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