sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
Hardness: 6.5-7 (for clasts); Color: Orange-tan matrix with grey clasts; Luster: Dull/Earthy; Structure: Clastic, poorly sorted; Specific Gravity: 2.1-2.6
- Hardness
- 6
- Color
- Orange-tan matrix with grey clasts
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6.5-7 (for clasts); Color: Orange-tan matrix with grey clasts; Luster: Dull/Earthy; Structure: Clastic, poorly sorted; Specific Gravity: 2.1-2.6
Formation & geological history
Formed by the lithification of rounded gravel and pebbles in high-energy environments like riverbeds or alluvial fans. The orange hue suggests oxidation (rusting) of iron minerals in the matrix over time.
Uses & applications
Used as a decorative stone in landscaping, a coarse aggregate in construction, and as a 'pudding stone' for geological collections.
Geological facts
Often called 'nature's concrete' because it looks like man-made cement. This specific specimen has been polished smooth by water action (river or beach erosion).
Field identification & locations
Identify in the field by looking for rounded, pebble-like inclusions (clasts) cemented within a finer-grained sandy matrix. Commonly found in ancient river systems globally.
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