sedimentary
Red Sandstone Pebble
Arenite with Hematite (Fe2O3) cement
Hardness: 6-7 (Mohs); Color: Reddish-brown to terracotta; Luster: Dull/Earthy; Crystal structure: Clastic (grainy); Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- Reddish-brown to terracotta
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Reddish-brown to terracotta; Luster: Dull/Earthy; Crystal structure: Clastic (grainy); Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in desert or river bed environments. The red color suggests oxidation (rusting) of iron minerals, common in Terrestrial settings during the Paleozoic and Mesozoic eras.
Uses & applications
Used primarily as decorative garden stone, construction aggregate, and occasionally for carving or architecture (brownstone). Small pebbles like this are common in landscaping.
Geological facts
The red color is caused by hematite coating the individual sand grains. This piece has been naturally polished and rounded (tumbled) by water action or wind erosion.
Field identification & locations
Identify by its gritty texture (sandpaper feel) and distinctive red streak. Commonly found in riverbeds, beaches, and sedimentary basins worldwide. Collectors often look for layering (bedding).
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