sedimentary
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
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 More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
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.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary