sedimentary

Jasper

Silicon dioxide (Microcrystalline quartz, SiO2)

Hardness of 6.5-7 on the Mohs scale, reddish-brown color due to iron inclusions, waxy luster, and a conchoidal fracture.

Identified October 28, 2026More sedimentary →

Get a report just like this from any photo, free.

Physical properties

Hardness of 6.5-7 on the Mohs scale, reddish-brown color due to iron inclusions, waxy luster, and a conchoidal fracture.

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

Used in ornamental carvings, jewelry making, lapidary art, and as a popular collector specimen.

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

Identify by its opaque nature and lack of cleavage; commonly found worldwide in riverbeds, volcanic rocks, and ancient marine 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)