sedimentary
Sandstone
Arenite (SiO2 primarily)
Hardness: 6-7 (Mohs); Color: Tan, reddish-brown, and buff; Luster: Dull/Earthy; Texture: Granular, sand-like grit; Cleavage: None.
- Hardness
- 6-7 (Mohs)
- Color
- Tan, reddish-brown, and buff
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, reddish-brown, and buff; Luster: Dull/Earthy; Texture: Granular, sand-like grit; Cleavage: None.
Formation & geological history
Formed by the accumulation and cementation of mineral particles or rock fragments of sand size, typically in river beds, beaches, or deserts. This specimen shows water-worn rounding.
Uses & applications
Commonly used as a building material, in the manufacture of glass, as an abrasive, and for landscaping.
Geological facts
Sandstone represents about 20% of all sedimentary rocks on Earth. The layers or 'lamination' seen in some specimens record the ancient environment's current or wind patterns.
Field identification & locations
Identified by its gritty feel (like sandpaper). Common in sedimentary basins worldwide. Collectors look for unique banding or fossils within the layers.
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