sedimentary

Red Jasper

Microcrystalline Quartz (SiO2)

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

Identified November 5, 2026More sedimentary →

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Physical properties

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

Forms through the hydrothermal deposition of silica-rich fluids or accumulation of radiolarian ooze, often in marine sedimentary environments.

Commonly used for ornamental carvings, polished cabochons in jewelry, and as a popular specimen for rock collectors.

The vibrant red color is caused by iron oxide impurities trapped within the microcrystalline quartz matrix.

Identified easily by its lack of cleavage, waxy luster, and rich red color; found globally in regions with ancient volcanic or marine activity.

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)