sedimentary

Mixed River Pebbles (Jasper, Hematite, and Quartzites)

Silicon dioxide (Jasper/Quartz) and Iron oxide (Hematite)

AI-generated identification · may be incorrect

Hardness ranges from 5.5 to 7 on the Mohs scale. Colors include reddish-brown, dark grey, and metallic silver. Luster varies from dull to metallic and waxy. Crystal structure is microcrystalline quartz and rhombohedral hematite.

Identified July 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through weathering, erosion, and aqueous transport of various mineral-rich parent rocks, subsequently rounded and polished by water action in riverbeds over millions of years.

Uses & applications

Used primarily in lapidary work, landscaping, decorative landscaping, and as pocket specimens for amateur rockhounds.

Geological facts

River pebbles often accumulate in placers where heavy minerals like hematite concentrate alongside durable silicates like jasper due to their specific gravity.

Field identification & locations

Found globally in active riverbeds, alluvial plains, and ancient gravel terraces. Easily identified in the field by their smooth, water-worn shapes and varied mineralogy.