sedimentary

Jasper

Silicon Dioxide (Microcrystalline Quartz)

Hardness of 6.5 to 7 on the Mohs scale, earthy luster, opaque, and colored yellow, brown, or red by impurities.

Identified October 23, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, earthy luster, opaque, and colored yellow, brown, or red by impurities.

Formed through the silification of sedimentary or volcanic rocks, precipitating from silica-rich solutions over millions of years.

Used widely in ornamental carvings, cabochons, jewelry, and polished display specimens.

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

Identified by its conchoidal fracture and opaque, multicolored patterns; commonly found globally in alluvial deposits and hydrothermal veins.

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)