sedimentary
Sandstone (Red Sandstone)
Arenite (predominantly SiO2 with Fe2O3 cement)
Hardness: 6-7 (Mohs scale), Color: Reddish-pink to brownish-orange, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Reddish-pink to brownish-orange, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in desert or river environments. The red color is caused by iron oxide (hematite) coating the grains.
Uses & applications
Used widely as a building material, paving stone, decorative garden rock, and sometimes in sculpture due to its ease of masonry.
Geological facts
Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. The famous 'Red Rocks' of the American Southwest are primarily composed of this type of stone.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in basins and mountainous regions. Collectors should look for unique layering (cross-bedding) or fossil inclusions.
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Sandstone
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