sedimentary
Quartzite Conglomerate
Conglomerate (clastic sedimentary rock)
Hardness: 6.5-7 Mohs; Color: Tan, grey, and white clasts; Luster: Dull to waxy; Texture: Coarse-grained with rounded pebbles; Specific Gravity: 2.6-2.8
- Hardness
- 6
- Color
- Tan, grey, and white clasts
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Tan, grey, and white clasts; Luster: Dull to waxy; Texture: Coarse-grained with rounded pebbles; Specific Gravity: 2.6-2.8
Formation & geological history
Formed through the lithification of rounded pebbles and sand-sized grains, typically in high-energy environments like riverbeds or beaches where water rounds the stones over time.
Uses & applications
Primarily used as construction aggregate, road base, and occasionally as decorative landscaping stones.
Geological facts
Conglomerates are like 'natural concrete'; the rounded shape of the pebbles indicates they traveled a long distance from their source before being deposited.
Field identification & locations
Identify by looking for rounded pebbles (clasts) cemented within a finer-grained matrix. Common in ancient river basins and mountain runoff areas. Collectors look for unique clast colors.
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