sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, red to brownish-red color due to iron inclusions, waxy luster, and conchoidal fracture.

Identified November 4, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, red to brownish-red color due to iron inclusions, waxy luster, and conchoidal fracture.

Formed through the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often during ancient marine deposition.

Used primarily for ornamental carvings, cabochons, jewelry, and as a popular specimen for rock collectors.

Jasper has been used since ancient times to create seals, talismans, and decorative items due to its durability and rich color.

Identified by its distinctive opaque red coloration, high hardness, and smooth, glassy fracture; commonly found in riverbeds and mountainous regions.

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)