sedimentary
Asphalt (Road Aggregate)
Bituminous conglomerate
Hardness: 1-3 (soft/brittle); Color: Black to dark gray; Luster: Dull to greasy; Structure: Granular/amorphous; Cleavage: None; Specific Gravity: 2.1-2.5
- Hardness
- 1-3 (soft/brittle)
- Color
- Black to dark gray
- Luster
- Dull to greasy
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Physical properties
Hardness: 1-3 (soft/brittle); Color: Black to dark gray; Luster: Dull to greasy; Structure: Granular/amorphous; Cleavage: None; Specific Gravity: 2.1-2.5
Formation & geological history
Formed through the mixture of bitumen (binder) with mineral aggregates like gravel, sand, or stone. Can occur naturally in tar pits or as a man-made composite.
Uses & applications
Primary material for road construction, pavement, roofing shingles, and waterproofing.
Geological facts
While frequently man-made, natural asphalt (bitumen) has been used since ancient times for mummification in Egypt and as a sealant for boats in Mesopotamia.
Field identification & locations
Identify by its dark color, crumbly texture, and the distinct smell of petroleum when heated. Commonly found on road surfaces or near construction sites.
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