sedimentary
Sandstone (Muddy/Silty Variety)
Arenite with high silt/clay content (clastic sedimentary rock)
Hardness: 6-7 (Mohs scale) if quartz-rich; Color: Tan, beige, or light brown; Luster: Dull or earthy; Crystal Structure: Clastic grain texture; Cleavage: None (breaks with irregular bedding planes); Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale) if quartz-rich
- Color
- Tan, beige, or light brown
- Luster
- Dull or earthy
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Physical properties
Hardness: 6-7 (Mohs scale) if quartz-rich; Color: Tan, beige, or light brown; Luster: Dull or earthy; Crystal Structure: Clastic grain texture; Cleavage: None (breaks with irregular bedding planes); Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments. This specimen likely originated from a low-energy fluvial or marine environment where fine silt and sand were deposited together. Geological age varies widely by location but matches common bedrock formations.
Uses & applications
Commonly used as a building stone, in road base construction, and as a source of silica for glassmaking. In individual specimen form, it is used for geological educational purposes or as simple landscaping aggregate.
Geological facts
Sandstone accounts for approximately 10-20% of the Earth's sedimentary rocks. It often preserves fossils, ripple marks, or evidence of ancient wind and water currents that were present millions of years ago.
Field identification & locations
Identify in the field by its 'gritty' feel (like sandpaper) and the presence of visible layers or bedding. It is found globally in canyons, riverbeds, and coastal outcroppings. Collectors should look for unique banding or fossil inclusions.
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