sedimentary
Red Sandstone / Quartzite Pebble
Quartz Arenite / Quartzite
Mohs hardness 6 to 7, dull to earthy luster, reddish-brown to pinkish color due to iron oxide impurities, fine to medium-grained texture, composed primarily of quartz grains.
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Physical properties
Mohs hardness 6 to 7, dull to earthy luster, reddish-brown to pinkish color due to iron oxide impurities, fine to medium-grained texture, composed primarily of quartz grains.
Formation & geological history
Formed from the deposition, compaction, and cementation of sand grains rich in iron oxides in fluvial, desert, or shallow marine environments, later rounded by stream or wave action.
Uses & applications
Commonly used as decorative landscape stone, gravel, and in general construction aggregate. Smooth river pebbles are popular for lapidary tumbling and crafts.
Geological facts
The distinctive red color comes from tiny amounts of hematite or iron oxide coating the quartz grains. Over time, water and sediment movement smoothed this rock into a rounded river pebble.
Field identification & locations
Identified by its sandy, granular texture, reddish-brown color, and rounded pebble shape. Commonly found along riverbeds, beaches, and glacial till worldwide.
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