sedimentary

Iron-rich sandstone or lateritic rock

Ferruginous sandstone; predominantly quartz (SiO₂) with iron oxides/hydroxides such as hematite and goethite

AI-generated identification · may be incorrect

Brown to reddish-brown, earthy to dull/submetallic luster, irregular granular texture, and possible iron-stained pits; hardness about 5–7 depending on cementation, with no obvious cleavage. The wet glossy appearance is likely surface moisture rather than natural vitreous luster.

Identified September 10, 2026More sedimentary →

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At a glance

Common name: Iron-rich sandstone or lateritic rock
Scientific name: Ferruginous sandstone; predominantly quartz (SiO₂) with iron oxides/hydroxides such as hematite and goethite
Category: sedimentary
Identified: September 10, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common hand specimen; more if unusually attractive, locality-documented, or mineralized.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Formed when quartz-rich sediment was cemented and heavily stained or bound by iron oxides, commonly in oxidizing soils, river deposits, or weathering profiles; exact geological age cannot be determined from the image. It may also be a weathered ironstone fragment.

Uses & applications

Usually used as a decorative or teaching specimen; larger, durable deposits can serve as aggregate or low-grade iron ore. Collector value is generally minimal.

Geological facts

Iron minerals produce the characteristic rusty color, while the dark brown areas may reflect manganese oxides or organic staining. The specimen’s identity cannot be confirmed without tests such as a streak test, hardness test, and density measurement.

Field identification & locations

Common in tropical and subtropical weathering zones, sedimentary basins, and gravel beds; it may be attracted weakly by a magnet if magnetite is present. Look for a reddish-brown streak and gritty quartz grains.