Rock Identifier
Concrete Fragment (Hardened Portland cement and mineral aggregate) — sedimentary (anthropogenic)
sedimentary (anthropogenic)

Concrete Fragment

Hardened Portland cement and mineral aggregate

Hardness: 3-7 Mohs (variable), Color: Grey, mottled white and tan, Luster: Dull/Earthy, Crystal Structure: Amorphous and crystalline mix, Specific Gravity: 2.2-2.5

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Physical properties

Hardness: 3-7 Mohs (variable), Color: Grey, mottled white and tan, Luster: Dull/Earthy, Crystal Structure: Amorphous and crystalline mix, Specific Gravity: 2.2-2.5

Formation & geological history

Man-made construction material formed by the chemical reaction of cement and water (hydration) which binds aggregates like sand and stone together. Modern era.

Uses & applications

Used universally in civil engineering, road construction, residential buildings, and infrastructure.

Geological facts

Concrete is the most widely used man-made material in the world. It actually gains strength over decades as it continues to hydrate and carbonatize.

Field identification & locations

Identified by its heterogeneous texture containing distinct rounded or crushed rock fragments embedded in a dull grey matrix. Typically found near demolition sites or urban areas.

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