sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
Hardness: 6-7 (based on quartz clasts); Color: Red, brown, and white; Luster: Variable (dull to vitreous); Structure: Clastic with rounded pebbles; Specific Gravity: 2.6-2.8
- Hardness
- 6-7 (based on quartz clasts)
- Color
- Red, brown, and white
- Luster
- Variable (dull to vitreous)
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Physical properties
Hardness: 6-7 (based on quartz clasts); Color: Red, brown, and white; Luster: Variable (dull to vitreous); Structure: Clastic with rounded pebbles; Specific Gravity: 2.6-2.8
Formation & geological history
Formed by the lithification of rounded gravel and pebbles, typically in high-energy environments like riverbeds or alluvial fans. This specimen likely contains quartz and iron-stained silicates.
Uses & applications
Used primarily in the construction industry as coarse aggregate, as a decorative stone in landscaping, and occasionally as an ornamental architectural material.
Geological facts
Conglomerates are often called 'puddingstones' because they look like fruit embedded in pudding. They are essential indicators of ancient river systems and shorelines.
Field identification & locations
Identify by the presence of rounded fragments (clasts) larger than 2mm cemented together. Commonly found in sedimentary basins and near old mountainous regions.
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