Igneous, Sedimentary, and Metamorphic mix
Crushed Stone / Gravel (Multiple Rock Types)
Lithic fragments (undifferentiated)
Hardness: variable (3-7 Mohs); Color: grey, tan, red, and black mix; Luster: dull to earthy; Texture: angular to sub-rounded grains.
- Hardness
- variable (3-7 Mohs)
- Color
- grey, tan, red, and black mix
- Luster
- dull to earthy
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Physical properties
Hardness: variable (3-7 Mohs); Color: grey, tan, red, and black mix; Luster: dull to earthy; Texture: angular to sub-rounded grains.
Formation & geological history
Formed through the mechanical weathering or industrial crushing of various parent rocks. This mix represents a standard construction-grade aggregate often sourced from riverbeds or quarries.
Uses & applications
Used primarily in construction for road base, concrete reinforcement, driveway surfacing, and as a drainage medium.
Geological facts
Aggregate is the world's most consumed natural resource after water. One mile of a typical four-lane highway uses about 38,000 tons of crushed stone.
Field identification & locations
Identify by the diverse mix of grain colors and angular shapes. Found globally in driveways, roadsides, and construction sites. Not usually a collector's item in this form.
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