sedimentary

Jasper

Silicon dioxide (SiO2) with impurities

Hardness 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque brown color, conchoidal fracture, specific gravity 2.58 to 2.91.

Identified October 18, 2026More sedimentary →

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Physical properties

Hardness 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque brown color, conchoidal fracture, specific gravity 2.58 to 2.91.

Formed via the precipitation of silica-rich fluids in sedimentary or volcanic environments, often during ancient hydrothermal activity.

Used in ornamental carvings, jewelry, lapidary arts, and collected as a decorative specimen.

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

Commonly found as water-worn pebbles in stream beds and glacial till; identifiable by its dense, opaque brown surface and smooth conchoidal breakage.

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)