sedimentary

Red Jasper

Silicon dioxide with iron inclusions (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque red to brownish-red color, and a vitreous to dull luster with microcrystalline crystal structure.

Identified October 24, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque red to brownish-red color, and a vitreous to dull luster with microcrystalline crystal structure.

Formed from silica-rich sediments or volcanic ash, heavily precipitated with iron oxide impurities during ancient marine or hydrothermal processes.

Commonly used for tumbled stones, cabochons in jewelry, decorative carvings, and as an ornamental gemstone.

Red jasper has been utilized since ancient times for amulets, seals, and weaponry, mentioned across various historical and biblical texts.

Easily identified by its deep red color, lack of cleavage, and smooth waxy polish when tumbled; found worldwide in riverbeds and mountainous regions.

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)