sedimentary

Iron-oxide-stained rock fragment, possibly ironstone

Indeterminate iron-rich rock; iron oxides/hydroxides such as hematite (Fe₂O₃) or goethite (FeO(OH)) may provide the rusty coloration

AI-generated identification · may be incorrect

Small, rough, brown-to-rust specimen with dark patches and an irregular fracture; no distinct crystals are visible. Hardness and luster cannot be reliably determined from the photograph; ironstone commonly has variable hardness and a dull to earthy luster.

Identified October 6, 2026More sedimentary →

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At a glance

Common name: Iron-oxide-stained rock fragment, possibly ironstone
Scientific name: Indeterminate iron-rich rock; iron oxides/hydroxides such as hematite (Fe₂O₃) or goethite (FeO(OH)) may provide the rusty coloration
Category: sedimentary
Identified: October 6, 2026
Method: Standard

AI Estimated Value

Approximately $0–$2 as an unverified common fragment; more only if testing reveals an unusual or collectible mineral.

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

Iron-rich sediment or rock can become rusty brown through oxidation and weathering. The specimen’s exact rock type and age cannot be established visually; iron-rich materials are plausible around the Las Vegas region, which includes sedimentary rocks and mineralized exposures.

Uses & applications

This small fragment has no evident commercial use; ironstone is collected, and iron-rich ores have historically been used as sources of iron pigment or metal.

Geological facts

Rusty coloration commonly comes from iron oxides, but color alone does not identify a specific mineral or prove that a rock is an iron ore.

Field identification & locations

Look for a rusty streak, appreciable weight, or attraction to a magnet as clues, though none is conclusive. A fresh break and hardness/streak tests would help distinguish ironstone from stained sandstone or another local rock.