sedimentary
Sandstone
Sandstone (clastic sedimentary rock)
Hardness: 6-7 Mohs; Color: Tan, beige, brown; Luster: Dull/Earthy; Crystal structure: Granular clastic; Specific Gravity: 2.2-2.8; Feel: Gritty like sandpaper.
- Hardness
- 6-7 Mohs
- Color
- Tan, beige, brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, beige, brown; Luster: Dull/Earthy; Crystal structure: Granular clastic; Specific Gravity: 2.2-2.8; Feel: Gritty like sandpaper.
Formation & geological history
Formed over millions of years by the accumulation and lithification of sand-sized mineral particles or rock fragments, typically quartz or feldspar, in environments like deserts, river beds, or beaches.
Uses & applications
Used extensively in construction as a building stone, for paving, in the manufacture of glass, and as a reservoir rock for oil and natural gas.
Geological facts
Sandstone is one of the most common types of sedimentary rock and often preserves ripple marks or cross-bedding from ancient water currents or winds.
Field identification & locations
Identify by its gritty texture and visible sand grains. Common in the Western US, Sahara, and many mountain ranges. Collectors look for unique banding or fossil inclusions.
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