sedimentary

Jasper Pebble

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, earthy luster, opaque, and commonly displays multicolored patterns due to mineral impurities.

Identified November 7, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, earthy luster, opaque, and commonly displays multicolored patterns due to mineral impurities.

Formed through the silification of sedimentary deposits or volcanic ash, often taking millions of years to precipitate within rock fractures.

Used primarily in lapidary arts, decorative stone carvings, jewelry making, and as a popular specimen for rock collectors.

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

Identify by its conchoidal fracture, lack of scratchability by steel, and smooth water-worn surface when found in riverbeds and beaches.

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)