sedimentary
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
Hardness: 3–7 (varies by aggregate); Color: Gray base with multicolored stones; Luster: Dull/Earthy; Structure: Clastic/Granular; Specific Gravity: ~2.4
- Hardness
- 3–7 (varies by aggregate)
- Color
- Gray base with multicolored stones
- Luster
- Dull/Earthy
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Physical properties
Hardness: 3–7 (varies by aggregate); Color: Gray base with multicolored stones; Luster: Dull/Earthy; Structure: Clastic/Granular; Specific Gravity: ~2.4
Formation & geological history
Man-made material mimicking sedimentary conglomerate. Formed by mixing Portland cement, water, and sand with coarse aggregates (gravel or crushed stone) to create a stone-like bind.
Uses & applications
Primary building material for roads, sidewalks, foundations, and modern infrastructure.
Geological facts
Concrete is the most widely used man-made material in the world. Its use dates back to the Roman Empire, though modern Portland cement was developed in the 19th century.
Field identification & locations
Identify by the presence of a gray paste (cement) holding rounded or angular stones together. Found in urban environments globally. Generally not collected by mineral enthusiasts unless looking for specific embedded minerals.
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