sedimentary
Sandstone (Quartzose Sandstone)
Arenite (composed primarily of SiO2)
Hardness: 6-7 (Mohs scale), Color: tan to reddish-brown, 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: tan to reddish-brown, 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 deposited in desert dunes, riverbeds, or coastal environments over millions of years.
Uses & applications
Widely used in the construction of buildings, paving, and decorative garden features. Historically significant as a material for sculptures and monuments.
Geological facts
Sandstone is often porous enough to act as a natural filter for groundwater and can serve as a reservoir for petroleum and natural gas.
Field identification & locations
Identify in the field by its gritty 'sandpaper' texture and visible grain layers. Commonly found in canyonlands, river basins, and coastal cliffs. Great for beginners to collect due to its abundance.
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Sandstone
Arenite (primarily SiO2)
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