sedimentary
Red Sandstone Pebble
Arenite with Hematite (Fe2O3) cement
Hardness: 6-7 (Mohs scale), Color: Terracotta/Reddish-brown, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Terracotta/Reddish-brown, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments, typically in desert or river environments where iron oxides (hematite) provide the red pigment. This specimen shows signs of fluvial or alluvial rounding.
Uses & applications
Used in landscaping, architectural facing, construction aggregate, and occasionally for lapidary tumbling practice.
Geological facts
The red color is usually indicative of an oxygen-rich environment during formation; sandstone can preserve ripple marks or dinosaur tracks in larger beds.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and its ability to leave a reddish streak if crushed. Commonly found in riverbeds, glacial deposits, and sedimentary basins like the Colorado Plateau.
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