sedimentary

Weathered iron-rich sandstone pebble

Ferruginous sandstone, chiefly quartz (SiO₂) cemented by iron oxides/hydroxides

AI-generated identification · may be incorrect

Typically Mohs 6–7 for quartz, with a rusty orange-brown color, dull to earthy luster, and granular texture; dark patches are likely iron/manganese oxide concentrations or weathered inclusions. No obvious cleavage; rounded shape reflects abrasion, not crystal form.

Identified August 20, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when quartz-rich sand was deposited, compacted, and cemented, with iron-bearing fluids producing the orange matrix; later erosion rounded it into a pebble. Its precise age and locality cannot be determined from the image.

Uses & applications

Used locally as aggregate, landscaping stone, and decorative material; generally unsuitable for gemstones because it is opaque and heterogeneous. Value is usually aesthetic or as a field specimen rather than commercial.

Geological facts

The orange coloration commonly comes from hematite and goethite coatings between quartz grains. Dark dendritic or irregular markings may represent manganese oxides, iron-rich concretions, or lithic fragments.

Field identification & locations

Look for visible sand grains, gritty texture, rusty streaking, and strong resistance to scratching by steel; dilute acid typically produces little or no reaction. Common in streambeds, glacial deposits, deserts, and weathered sandstone terrains.