sedimentary
Sandstone (Quartz-rich)
Arenite (Quartz Arenite)
Hardness: 6-7 (on Mohs scale); Color: Tan, beige, or grey with speckled mineral grains; Luster: Dull/Earthy; Structure: Granular/Clastic with visible sand grains; Cleavage: None; Specific Gravity: 2.2-2.8.
- Hardness
- 6-7 (on Mohs scale)
- Color
- Tan, beige, or grey with speckled mineral grains
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (on Mohs scale); Color: Tan, beige, or grey with speckled mineral grains; Luster: Dull/Earthy; Structure: Granular/Clastic with visible sand grains; 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, river, or coastal environments. This specimen appears water-worn, likely from a riverbed or beach.
Uses & applications
Commonly used in construction as a building material, for pavers, and in the production of glass (if high silica content).
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The famous red rocks of the Grand Canyon and Petra in Jordan are primarily composed of sandstone layers.
Field identification & locations
Identify in the field by its sandpaper-like texture and visible grains. It can be found globally in sedimentary basins. Collectors often look for colorful banding (Liesegang rings) or fossil inclusions.
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