sedimentary
Sandstone (with Chert/Quartzite nodules)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 on Mohs scale; Color: Tan, buff, ochre; Luster: Dull/Earthy; Structure: Clastic, bedded layers; Cleavage: None
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, buff, ochre
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, buff, ochre; Luster: Dull/Earthy; Structure: Clastic, bedded layers; Cleavage: None
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in desert, river, or marine environments. The specific outcrop appears to be a weathered cliff face exhibiting mass wasting.
Uses & applications
Construction aggregate, building stone, pavers, and as a reservoir rock for oil, gas, and groundwater.
Geological facts
Sandstone preserves records of ancient environments through features like cross-bedding and ripple marks. It accounts for about 20% of all sedimentary rocks on Earth.
Field identification & locations
Identify by its gritty texture (like sandpaper) and visible layering. Common in arid mountainous regions and coastal cliffs. Collectors look for unique banding or fossil inclusions.
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