sedimentary (alluvial deposit)
River Rock (Quartz-dominated)
Silicon Dioxide (SiO2) mixture with varied clastic sediments
Hardness: 7 (Mohs scale), Color: tan, white, brown, and grey. Luster: dull to waxy (smooth/polished appearance). Structure: amorphous to microcrystalline. Cleavage: none/conchoidal fracture.
- Hardness
- 7 (Mohs scale), Color: tan, white, brown, and grey
- Color
- tan, white, brown, and grey
- Luster
- dull to waxy (smooth/polished appearance)
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Physical properties
Hardness: 7 (Mohs scale), Color: tan, white, brown, and grey. Luster: dull to waxy (smooth/polished appearance). Structure: amorphous to microcrystalline. Cleavage: none/conchoidal fracture.
Formation & geological history
Formed through the erosion of larger rock formations over millions of years; these specimens are shaped by hydraulic action in riverbeds and glacial runoff during the Holocene and Pleistocene epochs.
Uses & applications
Used primarily in decorative landscaping, interior design (fountains/planters), construction aggregate, and aquatic environments due to pH neutrality.
Geological facts
River rocks are naturally tumbled 'clastic' sediments. The smoothness of these stones is a direct indicator of the distance they have traveled from their original mountain source—the smoother the stone, the longer the journey.
Field identification & locations
Identify in the field by their rounded, water-worn edges and smooth texture. Commonly found in floodplains, deltas, and dry riverbeds. For collectors, look for unique patterns like 'banded' chert or pure translucent quartz among the mix.
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