sedimentary
Sandstone with Iron Oxide
Arenite (SiO2 with Fe2O3 inclusions)
Hardness: 6-7 (on Mohs scale); Color: Tan, yellow, reddish-brown; Luster: Dull/Earthy; Crystal Structure: Clastic granular; Cleavage: None; Specific Gravity: 2.2-2.8.
- Hardness
- 6-7 (on Mohs scale)
- Color
- Tan, yellow, reddish-brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (on Mohs scale); Color: Tan, yellow, reddish-brown; Luster: Dull/Earthy; Crystal Structure: Clastic granular; Cleavage: None; Specific Gravity: 2.2-2.8.
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. These specimens often feature iron oxide staining (limonite or hematite) from percolating groundwater, typically in continental or marine environments.
Uses & applications
Commonly used as a building material, road base, or in the glass-making industry if highly pure. Low-grade specimens like this are primarily of geological study value.
Geological facts
Sandstone represents about 20% of all sedimentary rocks on Earth. The dark patches in this specific specimen are likely 'Liesegang rings' or iron-rich concretions formed by chemical precipitation.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layering. It is found globally in deserts, riverbeds, and ocean basins. For collectors, look for unique staining patterns.
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