sedimentary (man-made/anthropogenic)
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
Hardness: 3-7 (variable based on aggregate); Color: Gray, tan, or beige with visible flecks; Luster: Dull or earthy; Structure: Granular/Massive; Specific Gravity: 2.2-2.5
- Hardness
- 3-7 (variable based on aggregate)
- Color
- Gray, tan, or beige with visible flecks
- Luster
- Dull or earthy
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Physical properties
Hardness: 3-7 (variable based on aggregate); Color: Gray, tan, or beige with visible flecks; Luster: Dull or earthy; Structure: Granular/Massive; Specific Gravity: 2.2-2.5
Formation & geological history
Modern formation via the mixing of Portland cement, water, and various sand/gravel aggregates. This specific piece appears to be a fragment of construction debris, likely processed from crushed sedimentary parent rocks.
Uses & applications
Primary use in construction for buildings, sidewalks, and infrastructure; as a fragment, it is often recycled as road base or fill material.
Geological facts
Concrete is the most widely used man-made material in existence; when it breaks down into the environment, it is sometimes referred to as 'anthropic rock' or 'technofossil' by geologists studying the Anthropocene.
Field identification & locations
Identify in the field by looking for a fine-grained, 'sandy' matrix holding larger multicolored pebbles together. Commonly found in urban environments, demolition sites, and riverbeds near industrial areas.
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