sedimentary

Jasper

Silicon dioxide (Microcrystalline quartz, SiO2)

Hardness of 6.5-7 on the Mohs scale, opaque luster, variable colors including green with reddish veins, and a conchoidal fracture.

Identified November 7, 2026More sedimentary →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, opaque luster, variable colors including green with reddish veins, and a conchoidal fracture.

Formed by the precipitation of silica-rich fluids in sedimentary basins or volcanic environments over millions of years.

Used primarily for ornamental carvings, cabochons, polished decorative stones, and lapidary art.

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

Identified easily by its opaque, dense appearance and lack of cleavage; commonly found in riverbeds and mountainous regions 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)