sedimentary
Red Sandstone Pebble
SiO2 with Fe2O3 (Quartz sandstone with hematite coating)
Hardness: 6-7 on Mohs scale; Color: Reddish-brown to terracotta; Luster: Dull, earthy; Texture: Fine-grained, sandy feel; Cleavage: None
- Hardness
- 6-7 on Mohs scale
- Color
- Reddish-brown to terracotta
- Luster
- Dull, earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Reddish-brown to terracotta; Luster: Dull, earthy; Texture: Fine-grained, sandy feel; Cleavage: None
Formation & geological history
Formed through the accumulation, compaction, and cementation of quartz grains in ancient desert sand dunes, alluvial fans, or river beds. The red color is caused by the oxidation of iron minerals (hematite) surrounding the sand grains.
Uses & applications
Commonly used in construction, landscaping, decorative stone work, and as a educational geology specimen. Rounded pebbles are popular in gravel walkways and riverbed aquascaping.
Geological facts
Red sandstones are responsible for some of the world's most famous natural landmarks, such as Zion National Park, Sedonas red rocks in Arizona, and Petra in Jordan.
Field identification & locations
Identified by its distinctive gritty sand-like texture and rust-red color. Highly abundant along beaches, river beds, and eroded sedimentary rock formations worldwide.
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