sedimentary

Banded ironstone (likely jasper-rich ironstone)

Iron-oxide-rich silica rock, chiefly hematite/goethite with microcrystalline quartz (jasper)

AI-generated identification · may be incorrect

Opaque, rusty red-brown and ochre bands with a dull to slightly waxy luster; likely hardness about 5.5–7, with no obvious cleavage. The specimen’s small size and lighting prevent reliable mineral confirmation.

Identified October 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Iron-rich sediments formed through chemical precipitation and later silicification, commonly in ancient Precambrian basins; the exact age and locality cannot be determined from the image.

Uses & applications

Decorative and lapidary material, including cabochons and carvings; ironstone also has significance as iron ore when iron-rich enough.

Geological facts

Alternating iron-oxide and silica-rich layers create the striking banding characteristic of many jaspers and ironstones.

Field identification & locations

Look for opaque, earthy red-brown bands and a hard, non-cleaving surface; a streak and hardness test can help distinguish iron oxides from jasper. Common ironstone and jasper occur worldwide.