sedimentary
Sandstone (with Iron Oxide)
Quartz Arenite / Ferruginous Sandstone (SiO2 with Fe2O3)
Hardness: 6-7 (Mohs scale), Color: Brownish-yellow to tan with dark iron staining, Luster: Dull, earthy, or granular, Crystal Structure: Microcrystalline quartz grains in sedimentary matrix, Cleavage: None (conchoidal to uneven fracture)
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Brownish-yellow to tan with dark iron staining, Luster: Dull, earthy, or granular, Crystal Structure: Microcrystalline quartz grains in sedimentary matrix, Cleavage: None (conchoidal to uneven fracture)
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in riverbeds, deserts, or coastal environments. Iron oxides precipitate during diagenesis to give it a distinct brown hue.
Uses & applications
Commonly used as a building material, paving stone, landscaping accent, and in soil conditioning. Raw, unrefined field samples hold interest primarily for educational collections.
Geological facts
Iron oxides such as hematite and goethite act as natural cement between quartz grains, imparting reddish-brown earthy shades to sandstone around the world.
Field identification & locations
Identified by its distinctly gritty sand-like texture when rubbed. Highly abundant in sedimentary rock formations, canyons, and stream beds worldwide.
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