sedimentary
Conglomerate / Breccia Matrix (Aggregated Rock)
Sedimentary Breccia / Conglomerate
Hardness: 3-7 (variable depending on mineral matrix and clasts); Color: Greyish-green to dark grey angular clasts set in a light-colored matrix; Luster: Dull to earthy; Texture: Clastic, unsorted fragments bound by fine-grained mineral cement.
- Hardness
- 3-7 (variable depending on mineral matrix and clasts)
- Luster
- Dull to earthy
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Physical properties
Hardness: 3-7 (variable depending on mineral matrix and clasts); Color: Greyish-green to dark grey angular clasts set in a light-colored matrix; Luster: Dull to earthy; Texture: Clastic, unsorted fragments bound by fine-grained mineral cement.
Formation & geological history
Formed through the cementation of angular to semi-rounded rock fragments (clasts) transported over short distances by water, landslide deposits, or high-energy sedimentary environments.
Uses & applications
Used primarily in construction aggregate, decorative stone cladding, floor tiles (terrazzo style), and geological study.
Geological facts
Breccia and conglomerate rocks retain a snapshot of ancient river beds, alluvial fans, or debris flows, preserving fragments of older rocks intact.
Field identification & locations
Identified by visible angular or rounded clasts embedded within a contrasting fine-grained matrix. Widely found in mountain bases, ancient stream beds, and fault zones.
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