sedimentary
Crushed Stone / Gravel
Aggregate (mixed lithology)
Varies by specific rock type; typically includes quartz, limestone, or granite fragments with hardness ranging from 3 to 7 on the Mohs scale. Colors are predominantly earth tones, browns, grays, and tans with dull to vitreous lusters.
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Physical properties
Varies by specific rock type; typically includes quartz, limestone, or granite fragments with hardness ranging from 3 to 7 on the Mohs scale. Colors are predominantly earth tones, browns, grays, and tans with dull to vitreous lusters.
Formation & geological history
Formed through the mechanical weathering, quarrying, and crushing of larger parent rock formations, often glacial or river-deposited alluvial materials.
Uses & applications
Widely used in construction as aggregate for concrete, road base, railway ballast, and landscaping gravel.
Geological facts
Aggregates are the most mined materials in the world, serving as the fundamental raw material for modern infrastructure and civil engineering.
Field identification & locations
Commonly found in driveways, landscaping beds, and construction sites worldwide. Identified by angular or rounded mixed rock fragments of varying sizes.
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