sedimentary
Sandstone / Ironstone Concretion
Arenite / Ferruginous Sandstone (composed mainly of SiO2 and Fe-oxides)
AI-generated identification · may be incorrectHardness 6-7 (individual quartz grains) with low to moderate bulk cohesion, earthy to dull luster, gritty texture, and reddish-brown color.
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Physical properties
Hardness 6-7 (individual quartz grains) with low to moderate bulk cohesion, earthy to dull luster, gritty texture, and reddish-brown color.
Formation & geological history
Formed through the accumulation, compaction, and cementation of sand-sized mineral grains, often cemented by iron oxides or calcite in terrestrial or shallow marine environments.
Uses & applications
Commonly quarried for construction materials, building stone, flagstone, and glassmaking raw materials.
Geological facts
Iron oxides like hematite and goethite act as natural cements in sandstone, giving it vibrant rust, red, and brown colors.
Field identification & locations
Identified in the field by its gritty sandpaper feel, visible sand grains, and tendency to shed loose grains when rubbed.
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