sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, waxy luster, opaque color variations including green and red, and conchoidal fracture.

Identified November 4, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, waxy luster, opaque color variations including green and red, and conchoidal fracture.

Formed through the accumulation of silica-rich sediments or volcanic ash, typically altered by hydrothermal fluids over millions of years.

Used extensively in ornamental carvings, cabochons, jewelry, and as decorative decorative stone.

Jasper has been utilized since ancient times for talismans, seals, and weaponry components due to its toughness and fracture properties.

Identified easily by its opaque appearance, hardness, and lack of cleavage; commonly found in riverbeds and ancient hydrothermal 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)