sedimentary
Sandstone/Quartzite
Sedimentary Rock (composed mainly of SiO2)
Hardness: 6-7 on Mohs scale; Color: Tan, brownish-grey; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Specific Gravity: 2.2-2.8.
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brownish-grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, brownish-grey; Luster: Dull/Earthy; Crystal structure: Clastic/Granular; Specific Gravity: 2.2-2.8.
Formation & geological history
Formed by the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, often in river beds, beaches, or deserts.
Uses & applications
Widely used as a building material in construction, road base, and occasionally in glass manufacturing if silica content is high.
Geological facts
Sandstone records historical environmental changes and is one of the most common sedimentary rocks on Earth's crust. It often serves as a reservoir for groundwater or oil.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible grains. Found worldwide in sedimentary basins. Collectors often look for fossil inclusions or unique bedding patterns.
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