sedimentary

Red Jasper

Silicon dioxide (SiO2) microcrystalline quartz

Mohs hardness of 6.5 to 7, rich red to reddish-brown color, opaque luster, and trigonal crystal system with conchoidal fracture.

Identified October 20, 2026More sedimentary →

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Physical properties

Mohs hardness of 6.5 to 7, rich red to reddish-brown color, opaque luster, and trigonal crystal system with conchoidal fracture.

Forms through the silicification of sedimentary deposits or volcanic ash, rich in iron oxides, precipitating in marine or hydrothermal environments.

Commonly used in lapidary arts, wire-wrapped jewelry, ornamental carvings, and holistic crystal collections.

Red jasper has been used since antiquity for amulets, seals, and weaponry by ancient civilizations including the Egyptians and Romans.

Identified by its deep red color, lack of cleavage, and high hardness; commonly sourced from India, Brazil, Russia, and the USA.

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)