sedimentary

Jasper River Stone

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, earthy brown color, dull to waxy luster, and cryptocrystalline structure.

Identified October 18, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, earthy brown color, dull to waxy luster, and cryptocrystalline structure.

Formed through the accumulation of silica-rich sediments and water weathering, often shaped by prolonged river transport.

Used primarily in lapidary work, decorative landscaping, tumbling, and as a polishing stone.

Jasper has been used since ancient times for talismans, seals, and weaponry due to its toughness and fracture resistance.

Found globally in stream beds and alluvial deposits; identified by its smooth, water-worn shape and lack of visible crystal faces.

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion

Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)