sedimentary
Asphalt Conglomerate
Artificial Bituminous Conglomerate
Hardness: 1-3 (matrix), variable (clasts); Color: Black to dark grey with lighter inclusions; Luster: Dull to greasy; Structure: Granular/fragmental; Specific Gravity: 2.3-2.4
- Hardness
- 1-3 (matrix), variable (clasts)
- Color
- Black to dark grey with lighter inclusions
- Luster
- Dull to greasy
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Physical properties
Hardness: 1-3 (matrix), variable (clasts); Color: Black to dark grey with lighter inclusions; Luster: Dull to greasy; Structure: Granular/fragmental; Specific Gravity: 2.3-2.4
Formation & geological history
Formed through the industrial mixing of bitumen (heavy petroleum) with mineral aggregates like sand, gravel, and crushed stone. This specific piece appears to be a weathered fragment of road surface or pavement.
Uses & applications
Used primarily in road construction, parking lots, and roofing materials due to its waterproofing and binding properties.
Geological facts
While it contains natural geological materials (rocks/sand), the binding agent is often a byproduct of petroleum refining. Over time, weathering can cause it to resemble natural sedimentary breccia or conglomerate.
Field identification & locations
Commonly found near roadsides, construction sites, and urban areas. Identification is usually confirmed by the smell of petroleum when heated or broken and the presence of mixed, angular pebbles in a black matrix.
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