sedimentary
Sedimentary River Rock
Siliciclastic Sedimentary Rock (Quartzite or Sandstone pebble)
Hardness varies between 6 and 7 on the Mohs scale depending on quartz content. Color ranges from grey to tan. Luster is dull to sub-vitreous. Texture is smooth and rounded due to water transport and weathering.
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Physical properties
Hardness varies between 6 and 7 on the Mohs scale depending on quartz content. Color ranges from grey to tan. Luster is dull to sub-vitreous. Texture is smooth and rounded due to water transport and weathering.
Formation & geological history
Formed through the accumulation, compaction, and cementation of mineral particles or rock fragments over millions of years, followed by alluvial transport in rivers or streams which rounds the edges.
Uses & applications
Used in landscaping, gardening, decorative gravel, and rock tumbling or collecting by hobbyists.
Geological facts
River rocks are naturally tumbled over many years by the constant movement of water, sand, and other pebbles, creating their smooth and rounded shapes.
Field identification & locations
Commonly found along riverbeds, stream banks, lake shores, and beaches. Easily identified by its smooth, water-worn texture and rounded shape.
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