sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
Hardness: 6-7 Mohs; Color: reddish-brown; Luster: dull to earthy; Structure: granular/clastic; Cleavage: none; SG: 2.2-2.8.
- Hardness
- 6-7 Mohs
- Color
- reddish-brown
- Luster
- dull to earthy
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Physical properties
Hardness: 6-7 Mohs; Color: reddish-brown; Luster: dull to earthy; Structure: granular/clastic; Cleavage: none; SG: 2.2-2.8.
Formation & geological history
Formed by the accumulation and cementation of sand-sized mineral grains, primarily quartz and feldspar, in desert or riverbed environments. Its red color comes from iron oxide (hematite) staining.
Uses & applications
Extensively used in construction, paving, landscaping, and as a raw material in the manufacturing of glass and concrete.
Geological facts
Red sandstone is famous for creating iconic landscapes like the Grand Canyon and the 'Red Rocks' of Sedona. It often preserves ripple marks and cross-bedding from ancient environments.
Field identification & locations
Identified by its gritty sandpaper-like texture and reddish hue. Commonly found in ancient basin deposits and riverbeds globally. Collectors look for unique weathering patterns.
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