sedimentary

Crushed Stone / Gravel

Aggregatus saxum (variable mineral composition)

AI-generated identification · may be incorrect

Hardness: 3-7 Mohs depending on composition; Color: Earthy brown and gray; Luster: Dull/Sub-metallic; Structure: Fragmented/clastic; Cleavage: None; Specific Gravity: 2.5-2.8

Hardness: 3-7 Mohs depending on composition
Color: Earthy brown and gray
Luster: Dull/Sub-metallic

Identified May 26, 2026More sedimentary →

Explore Crushed Stone / Gravel in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 3-7 Mohs depending on composition; Color: Earthy brown and gray; Luster: Dull/Sub-metallic; Structure: Fragmented/clastic; Cleavage: None; Specific Gravity: 2.5-2.8

Formation & geological history

Formed through the mechanical weathering or industrial crushing of bedrock such as limestone, sandstone, or basalt. These fragments are typically derived from geological formations spanning hundreds of millions of years and are found in fluvial or human-made environments.

Uses & applications

Primarily used as a base material in construction, road aggregates, concrete production, and landscaping drainage.

Geological facts

Crushed stone is one of the most accessible and under-appreciated natural resources on Earth, comprising the majority of the total volume of modern infrastructure. It is often recycled for environmental sustainability.

Field identification & locations

Identify by its irregular, angular shape and earthy patina. Commonly found in driveway beds, construction sites, and near railway lines. Collectors focus on individual mineral inclusions often found within these fragments.