sedimentary

Weathered iron-rich sandstone or ferruginous quartzite

Quartz-rich sandstone, variably cemented by iron oxides (SiO₂ with hematite/goethite)

AI-generated identification · may be incorrect

Hardness about 6–7 if quartz-rich; tan, reddish-brown, and gray with earthy to dull luster, granular texture, and no obvious cleavage. The rounded shape suggests water-worn gravel; visible rusty coloration reflects iron-oxide staining.

Identified August 26, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich sandstone or ferruginous quartzite
Scientific name: Quartz-rich sandstone, variably cemented by iron oxides (SiO₂ with hematite/goethite)
Category: sedimentary
Identified: August 26, 2026
Method: Standard

AI Estimated Value

About $1–$10 as an ordinary loose specimen; up to $20–$50 if unusually attractive, locality-specific, or polished.

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

Likely formed from cemented quartz sand, with later oxidation producing hematite/goethite and surface weathering. Its exact geological age and locality cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, aggregate, and occasionally decorative material; this small specimen is mainly suitable for teaching or casual collecting. It has little jewelry value unless unusually patterned or polished.

Geological facts

Iron staining can create vivid red, orange, and brown zones without making the rock itself an iron ore. A glass-scratch test and acid test can help distinguish quartz-rich sandstone from softer carbonate rocks.

Field identification & locations

Common in sedimentary terrains, river gravels, deserts, and eroded uplands worldwide. Identify it by gritty texture, quartz-like grains, lack of fizz in dilute hydrochloric acid, and resistance to scratching by a steel knife; a precise field ID needs a fresh surface or thin section.