sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
Hardness: 6-7 (Mohs scale); Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, brown, or buff
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation, compaction, and cementation of sand-sized mineral grains or rock fragments. Typically deposited in river beds, beaches, or deserts over millions of years.
Uses & applications
Used widely in construction as a building stone and for making glass (if high purity silica). It is also a significant reservoir rock for groundwater and petroleum.
Geological facts
Sandstone can preserve fossilized footprints and ripple marks from ancient water currents. It makes up some of the world's most famous landscapes, such as the Grand Canyon and Petra.
Field identification & locations
Identified by its gritty 'sandpaper' feel and visible grains. Found globally in sedimentary basins. Collectors often look for colorful banding (Liesegang rings) or fossil inclusions.
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