Igneous, Sedimentary, and Metamorphic mix

Crushed Stone / Gravel (Multiple Rock Types)

Lithic fragments (undifferentiated)

AI-generated identification · may be incorrect

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

Identified June 22, 2026More igneous, sedimentary, and metamorphic mix →

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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.