sedimentary

Jasper in matrix

Microcrystalline quartz (SiO2) with impurities

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, colors include red, brown, and yellow with irregular fracture patterns.

Identified October 18, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, colors include red, brown, and yellow with irregular fracture patterns.

Formed through the silification of sedimentary deposits or volcanic ash in silica-rich hydrothermal environments over millions of years.

Used primarily for ornamental carvings, cabochons, lapidary art, and mineral specimen collecting.

Jasper has been used since ancient times for talismans, seals, and weaponry components across various civilizations.

Identified by its conchoidal fracture, lack of cleavage, and vibrant opaque colors; commonly found in riverbeds and mountainous hydrothermal zones.

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)