sedimentary
Sandstone Cobble
Arenite (Sandstone)
Hardness: 6-7 (Mohs scale), Color: tan to grayish-brown, Luster: dull/earthy, Structure: clastic texture with visible sand-sized grains, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan to grayish-brown, Luster: dull/earthy, Structure: clastic texture with visible sand-sized grains, Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments, typically through pressure and mineral precipitation over millions of years. This specimen shows signs of river or coastal erosion, which smoothed its edges.
Uses & applications
Used extensively in construction as building stone, road base, and decorative landscaping. High-quality sandstone is used for glass manufacturing.
Geological facts
Sandstone can preserve fossil footprints and ripple marks from ancient riverbeds or beaches; it is one of the most common sedimentary rocks on Earth's surface.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible layering (bedding). Found worldwide in deserts, riverbeds, and ocean coastlines. Highly common in the field.
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Cone-in-cone structure (Secondary Sedimentary Structure)
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Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
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Chert Breccia
Brecciated Chert (Microcrystalline Silica)
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Sandstone
Arenite (primarily SiO2)
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