sedimentary
Conglomerate with Quartz Inclusions
Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)
Hardness: 6-7 (on Mohs scale); Color: Grayish-tan matrix with clear to white inclusions; Luster: Dull/Earthy matrix with Vitreous inclusions; Structure: Clastic; Cleavage: None; Specific Gravity: ~2.6-2.7
- Hardness
- 6-7 (on Mohs scale)
- Color
- Grayish-tan matrix with clear to white inclusions
- Luster
- Dull/Earthy matrix with Vitreous inclusions
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Physical properties
Hardness: 6-7 (on Mohs scale); Color: Grayish-tan matrix with clear to white inclusions; Luster: Dull/Earthy matrix with Vitreous inclusions; Structure: Clastic; Cleavage: None; Specific Gravity: ~2.6-2.7
Formation & geological history
Formed through the lithification of rounded gravel and boulders, typically in high-energy environments like riverbeds or alluvial fans over millions of years
Uses & applications
Used primarily in the construction industry as coarse aggregate for concrete and road building; also of interest to amateur rock collectors
Geological facts
Conglomerates are essentially 'nature's concrete.' The presence of clear quartz within the matrix suggests the sediment source was rich in igneous quartz veins
Field identification & locations
Identify in the field by looking for rounded rock fragments (clasts) larger than 2mm cemented together. Found globally in ancient river systems
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