sedimentary

Iron-rich sandstone or weathered siltstone

Clastic siliciclastic sedimentary rock, likely ferruginous sandstone (mostly quartz and feldspar cemented by iron oxides)

AI-generated identification · may be incorrect

Pinkish-red to brown, dull earthy luster, fine-grained and weakly layered with possible iron staining; likely Mohs hardness about 5–7, with no obvious cleavage. Exact texture and composition are uncertain from the photograph.

Identified August 31, 2026More sedimentary →

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At a glance

Common name: Iron-rich sandstone or weathered siltstone
Scientific name: Clastic siliciclastic sedimentary rock, likely ferruginous sandstone (mostly quartz and feldspar cemented by iron oxides)
Category: sedimentary
Identified: August 31, 2026
Method: Standard

AI Estimated Value

$0–$5 as a common found specimen; $5–$20 if unusually attractive or demonstrably from a notable locality.

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 or silt was deposited, compacted, and cemented, with iron oxides producing the red coloration. Its geological age cannot be determined visually; similar rocks range from Precambrian to recent formations.

Uses & applications

Used locally as building stone, landscaping material, aggregate, and occasionally as a decorative specimen. The pictured fragment has minimal commercial value.

Geological facts

Red coloration commonly reflects hematite or limonite cement rather than abundant red minerals. Weathering can soften edges and expose contrasting layers or cement zones.

Field identification & locations

Likely identifiable by gritty or smooth fine texture, red streak or powder, and resistance to scratching; dilute acid should produce little or no reaction. Common in continental sedimentary basins and glacial or stream gravels.