sedimentary
Sandstone Pebble
Arenite (SiO2 dominated with iron oxide)
Hardness: 6-7 on Mohs scale; Color: Reddish-brown to tan; Luster: Dull, earthy; Crystal Structure: Granular/clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 on Mohs scale
- Color
- Reddish-brown to tan
- Luster
- Dull, earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Reddish-brown to tan; Luster: Dull, earthy; Crystal Structure: Granular/clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed by the compaction and cementation of mineral particles or rock fragments (mainly quartz and feldspar) in fluvial, desert, or marine environments. Iron oxide acts as a natural cement giving it the reddish color. rounded through stream or coastal erosion.
Uses & applications
Used extensively in construction, flagstone paving, landscaping gravel, and as a decorative stone.
Geological facts
Red and orange sandstones get their vivid hues from small trace amounts of hematite or goethite (iron oxide minerals) coating individual sand grains.
Field identification & locations
Identified by its sand-like texture, rough granular surface, and earthy luster. Found worldwide in riverbeds, beaches, and sedimentary rock outcrops.
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