sedimentary

Red Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque red to reddish-brown color, waxy to vitreous luster, and a conchoidal fracture.

Identified November 1, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque red to reddish-brown color, waxy to vitreous luster, and a conchoidal fracture.

Formed by the precipitation of silica from water rich in iron oxides, typically in marine or volcanic environments over millions of years.

Commonly used for lapidary work, cabochons, ornamental carvings, and low-cost jewelry.

Jasper has been used since ancient times for amulets, seals, and tools, and is frequently mentioned in historical texts.

Identified by its distinctive red color, opacity, and hardness; commonly found worldwide in riverbeds and sedimentary deposits.

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)