sedimentary
Sandstone (likely Quartz Sandstone)
Arenite (SiO2 based)
Hardness: 6-7 (Mohs scale), Color: tan, grey, or greenish-yellow (due to possible algae/weathering in image), Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Grain size: 0.06 to 2 mm.
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, grey, or greenish-yellow (due to possible algae/weathering in image), Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Grain size: 0.06 to 2 mm.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. These grains are often quartz or feldspar deposited in riverbeds, deserts, or coastal environments over millions of years.
Uses & applications
Major construction material, building stone for cladding and paving, glass manufacturing (if high silica content), and as a reservoir rock for oil and gas.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous Red Rocks in Colorado and the Treasury at Petra are both carved into sandstone formations.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible layers or bedding. It is common worldwide in sedimentary basins and coastal outcrops.
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