sedimentary

Weathered sandstone or iron-stained sedimentary rock

Quartz-rich sandstone, likely ferruginous sandstone (SiO₂ with iron-oxide cement)

AI-generated identification · may be incorrect

Hardness about 6–7 for quartz grains; brown to ochre, dull to earthy luster, and visibly granular/porous. Individual grains appear cemented together, with no obvious cleavage or large crystals; specific gravity is typically 2.2–2.7.

Identified August 24, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or iron-stained sedimentary rock
Scientific name: Quartz-rich sandstone, likely ferruginous sandstone (SiO₂ with iron-oxide cement)
Category: sedimentary
Identified: August 24, 2026
Method: Standard

AI Estimated Value

Usually $1–$10 as an unremarkable loose specimen; attractive, well-documented or unusually patterned pieces may sell for $10–$50.

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 sand accumulated, compacted, and cemented in a sedimentary basin; the rusty color comes from oxidized iron minerals such as hematite or goethite. Its exact geological age cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and landscaping material; attractive pieces may be collected or cut for decorative use, though this specimen appears ordinary.

Geological facts

Iron staining commonly produces yellow, orange, red, and brown tones in sandstone. Surface weathering can make the rock look darker and rougher than its fresh interior.

Field identification & locations

Look for visible sand grains, gritty texture, uneven fracture, and a lack of interlocking crystals; a steel nail generally will not scratch quartz-rich sandstone, but the cement may vary. Sandstone occurs widely in former beaches, deserts, river channels, and sedimentary plateaus worldwide.