Asphalt (Bituminous pavement fragment)

Physical Properties

Hardness: 1.5 - 3 (softens when heated); Color: Dark gray to black; Luster: Dull to greasy; Structure: Granular/fragmental (clastic aggregate in a matrix); Specific gravity: 2.2 - 2.4

Formation & Geological History

Formed through industrial mixing of mineral aggregate (sand, gravel, or crushed stone) with a liquid bitumen binder. While natural asphalt exists, this specimen appears to be modern construction material (pavement).

Uses & Applications

Primary use is in infrastructure for road surfacing, parking lots, and roofing shingles. It is highly recyclable.

Geological Facts

Asphalt is one of the most recycled materials on Earth. Naturally occurring asphalt (bitumen) has been used since ancient times for waterproofing boats and mummification in Egypt.

Field Identification & Locations

Identify in the field by its distinctive smell when struck or heated (petroleum odor), dark black color, and the presence of mixed mineral aggregates. It is often found near roads, construction sites, or demolition debris.

Identified on: 4/14/2026

Mode: Standard