sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
Hardness: 6-7 (Mohs scale), Color: Reddish-brown to rust orange, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Reddish-brown to rust orange, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains, primarily quartz and feldspar. The red color indicates the presence of iron oxide (hematite) during the lithification process, often in arid terrestrial environments.
Uses & applications
Used primarily as a building material, decorative stone, landscaping rock, and for paving. Historically significant in cathedral and monastery construction.
Geological facts
The red sandstones of the American Southwest, such as those in the Grand Canyon and Sedona, are world-famous for their vibrant strata. In many cultures, red sandstone is considered a symbol of grounding and stability.
Field identification & locations
Identifiable by its gritty sand-like texture and reddish staining that does not rub off easily. Can be found globally in basins where terrestrial sediments have accumulated.
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