sedimentary
Sandstone Cobble
Arenite (predominantly Quartz Sandstone)
Hardness: 6-7 (Mohs), Color: Tan, brown, and yellowish-orange due to iron oxidation, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs), Color: Tan, brown, and yellowish-orange due to iron oxidation, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen is a fluvial cobble, meaning its rounded shape was created by water erosion in a river or stream bed over thousands of years.
Uses & applications
Commonly used as construction aggregate, decorative landscaping stone, and in the manufacturing of glass if high in silica.
Geological facts
Sandstone can preserve fossil footprints and ripple marks from ancient environments. It is a major reservoir for groundwater and petroleum because of its porosity.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grains. Found globally in riverbeds, beaches, and desert environments. It is one of the most common sedimentary rocks on Earth's surface.
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