sedimentary

Iron-rich sandstone or laterite pebble

Ferruginous sandstone; chiefly quartz (SiO₂) cemented by iron oxides such as hematite/goethite

AI-generated identification · may be incorrect

Typically red-brown, earthy to dull luster, fine-grained and rounded from abrasion; hardness about 5–7 depending on cement, with no visible cleavage. The image suggests a dense, weathered iron-rich sedimentary pebble rather than a crystalline mineral.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand or weathered soil became cemented and stained by iron oxides, commonly in oxidizing continental or tropical weathering environments; exact age cannot be determined visually. Its smooth shape indicates transport by water or prolonged abrasion.

Uses & applications

Common material is used as aggregate, building stone, pigment, or iron ore when sufficiently iron-rich; this small specimen is mainly suitable for collecting or educational display.

Geological facts

The reddish color comes from microscopic hematite and/or goethite coatings between grains. A reddish-brown streak, strong density, and granular texture help distinguish it from many volcanic rocks.

Field identification & locations

Look for visible sand grains, earthy red-brown streak, irregular pores, and weak or absent magnetism; a steel scratch test and streak test are useful, though identification from one photograph is provisional. Common in river gravels, deserts, and lateritic regions worldwide.