sedimentary
Sandstone
Arenite
Hardness: 6-7 (Mohs scale), Color: tan, yellow, or buff with dark mineral flecks, Luster: dull/earthy, Structure: granular clastic texture, Cleavage: none.
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, yellow, or buff with dark mineral flecks, Luster: dull/earthy, Structure: granular clastic texture, Cleavage: none.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in riverbeds, deserts, or coastal environments over millions of years.
Uses & applications
Widely used as a building stone, paving material, and in the manufacturing of glass and grindstones.
Geological facts
Sandstone accounts for about 20 to 25 percent of all sedimentary rocks on Earth. It often contains fossils and provides crucial records of ancient environments.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible sand grains. Common in sedimentary basins worldwide. Collectors look for unique banding or fossil inclusions.
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Brecciated Chert (Microcrystalline Silica)
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Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
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Sandstone
Arenite (primarily SiO2)
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