sedimentary

Red Jasper

Silicon dioxide (SiO2)

Mohs hardness 6.5 to 7, earthy to vitreous luster, opaque red to brownish-red color, microcrystalline quartz structure.

Identified October 26, 2026More sedimentary →

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Physical properties

Mohs hardness 6.5 to 7, earthy to vitreous luster, opaque red to brownish-red color, microcrystalline quartz structure.

Formed by the precipitation of silica-rich fluids in marine environments or hydrothermal systems during the Precambrian era.

Used extensively for ornamental carvings, polished cabochons in jewelry, and as a durable lapidary material.

Red jasper has been utilized since ancient times for talismans, seals, and weaponry components across various civilizations.

Identified by its deep red color, conchoidal fracture, and lack of cleavage; commonly found in hydrothermal veins and sedimentary deposits worldwide.

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)