sedimentary

Jasper

Microcrystalline quartz (SiO2)

Hardness of 6.5-7 on the Mohs scale, opaque luster, various colors including red, brown, and green, trigonal crystal system with no cleavage.

Identified October 20, 2026More sedimentary →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, opaque luster, various colors including red, brown, and green, trigonal crystal system with no cleavage.

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

Used primarily in ornamental carvings, jewelry, and as a decorative stone for its aesthetic appeal.

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

Identify by its waxy luster, opaque nature, and conchoidal fracture; commonly found in riverbeds and hydrothermal veins globally.

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)