sedimentary

Red Jasper

Microcrystalline quartz, SiO2

Mohs hardness of 6.5 to 7, opaque red to brownish-red color, vitreous to dull luster, and conchoidal fracture.

Identified November 9, 2026More sedimentary →

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Physical properties

Mohs hardness of 6.5 to 7, opaque red to brownish-red color, vitreous to dull luster, and conchoidal fracture.

Forms from the silica-rich precipitation of hydrothermal fluids or silica-rich sediments, often in marine environments over millions of years.

Commonly used for tumbled stones, cabochons, carvings, and ornamental jewelry.

Red jasper has been used since ancient times for talismans, seals, and weaponry components by various civilizations.

Identified by its deep red color, lack of cleavage, and ability to scratch glass; 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)