mineral

Dark rounded pebble, likely hematite-rich ironstone

Possibly hematite (Fe₂O₃) or iron-rich goethite/limonite; the photo alone cannot confirm composition

AI-generated identification · may be incorrect

Smooth, rounded, dark gray-brown with a subdued metallic-to-submetallic sheen. Hardness and crystal structure cannot be determined from the image; hematite is Mohs 5–6.5 and has a red-brown streak.

Identified October 4, 2026More mineral →

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At a glance

Common name: Dark rounded pebble, likely hematite-rich ironstone
Scientific name: Possibly hematite (Fe₂O₃) or iron-rich goethite/limonite; the photo alone cannot confirm composition
Category: mineral
Identified: October 4, 2026
Method: Standard

AI Estimated Value

About $1–$10 for an ordinary pebble; more only if testing confirms a desirable mineral or unusual specimen.

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

Smooth, rounded, dark gray-brown with a subdued metallic-to-submetallic sheen. Hardness and crystal structure cannot be determined from the image; hematite is Mohs 5–6.5 and has a red-brown streak.

Formation & geological history

Could be an iron-oxide nodule or a water-worn pebble derived from iron-rich rock. Such materials form through oxidation and concentration of iron; age and specific formation setting are indeterminable visually.

Uses & applications

Iron ores are major sources of steelmaking iron; attractive polished pebbles may be kept as curios or used in crafts.

Geological facts

Hematite can look steel-gray while leaving a distinctive reddish-brown streak, a useful identification test on unglazed porcelain.

Field identification & locations

Check for a red-brown streak and unusually high heft; a magnet test may help rule out some alternatives but is not conclusive. Iron oxides occur worldwide, especially in weathered iron-rich rocks and sedimentary deposits.