sedimentary

Jasper in Matrix

Silicon dioxide embedded in sedimentary rock

Hardness of 6.5 to 7 on the Mohs scale, earthy luster, opaque, and microcrystalline quartz structure with conchoidal fracture.

Identified October 21, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, earthy luster, opaque, and microcrystalline quartz structure with conchoidal fracture.

Formed through the deposition of silica-rich fluids within sedimentary rock cavities, often during volcanic or hydrothermal activity.

Used in lapidary arts, ornamental carvings, cabochons, and as a popular specimen for mineral collectors.

Jasper has been used since ancient times for talismans, seals, and weaponry due to its durability and rich coloration.

Identify by its hardness, waxy luster, and contrasting matrix host rock; commonly found in hydrothermal veins and river gravels worldwide.

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)