sedimentary
Sandstone
Arenite (primarily SiO2)
Hardness: 6-7 (Mohs scale), Color: tan/light gray, Luster: dull/earthy, Structure: granular clastic texture, Cleavage: none, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan/light gray, Luster: dull/earthy, Structure: granular clastic texture, 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 riverbeds, deserts, or coastal environments over millions of years.
Uses & applications
Widely used in the construction industry as building stone and decorative paving. Also used as a reservoir rock for oil and natural gas.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Famous examples include the red rock formations in Sedona, Arizona and Petra in Jordan.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible bedding planes. Commonly found in riverbeds, beaches, and canyons. Collectors value specimens with unique weathering or rhythmic banding.
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Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
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Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
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Sandstone
Arenite (primarily SiO2)
sedimentary