sedimentary

Jasper

Silicon dioxide (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones like brown, red, and yellow, with a microcrystalline structure.

Identified November 11, 2026More sedimentary →

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

Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones like brown, red, and yellow, with a microcrystalline structure.

Formed from silica-rich precipitates in marine or hydrothermal environments, often dating back billions of years.

Used primarily in ornamental carvings, jewelry, and lapidary arts.

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

Identify by its waxy luster, hardness that scratches glass, and opaque earthy colors; commonly found globally in sedimentary and volcanic 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

Sandstone or Siltstone

Arenite (if sandstone)

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)