sedimentary
Red Sandstone
Quartz Arenite (iron-stained) / SiO2
Hardness 6-7 on Mohs scale, reddish-brown to pinkish color due to iron oxide (hematite), earthy to dull luster, granular texture made of fused quartz grains, uneven fracture.
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Physical properties
Hardness 6-7 on Mohs scale, reddish-brown to pinkish color due to iron oxide (hematite), earthy to dull luster, granular texture made of fused quartz grains, uneven fracture.
Formation & geological history
Formed by the compaction and cementation of sand-sized mineral grains, predominantly quartz. The distinctive red color is caused by iron oxides present during formation in arid, desert, or fluvial depositional environments.
Uses & applications
Widely used as a building material, paving stone, decorative landscaping rock, and for architectural masonry. Also collected for geological study.
Geological facts
Red sandstone formed famous geological structures around the world, including the red rock formations of Sedona, Arizona, and the ancient city of Petra in Jordan.
Field identification & locations
Can be identified in the field by its distinctive gritty feel, reddish-pink coloration, and visible quartz grains cemented together. Commonly found in ancient river basins, desert dunes, and sedimentary rock layers worldwide.
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