sedimentary (anthropogenic/man-made conglomerate)
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
Hardness: variable (binder is soft, aggregate is 6-7); Color: black or dark grey with multicolored inclusions; Luster: dull to greasy; Structure: granular/porous; Cleavage: none; SG: 2.3-2.5
- Hardness
- variable (binder is soft, aggregate is 6-7)
- Color
- black or dark grey with multicolored inclusions
- Luster
- dull to greasy
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Physical properties
Hardness: variable (binder is soft, aggregate is 6-7); Color: black or dark grey with multicolored inclusions; Luster: dull to greasy; Structure: granular/porous; Cleavage: none; SG: 2.3-2.5
Formation & geological history
Formed through industrial processes mixing bitumen (heavy petroleum) with aggregate (sand, gravel, crushed rock). Often found as debris near roadways or parking lots. Technically an 'anthropogenic sedimentary rock'.
Uses & applications
Used globally for road construction, pavement, and roofing. Smaller chunks are waste material but can be recycled into new pavement.
Geological facts
Naturally occurring asphalt (bitumen) has been used since ancient times for waterproofing boats and mummification, though this modern specimen is a refined petroleum product.
Field identification & locations
Identify by its distinct chemical/tar smell when heated or scratched, its sticky texture in high heat, and the presence of assorted crushed gravel bound by a black matrix. Commonly found near infrastructure.
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