sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 7 on the Mohs scale, opaque luster, various earth tones including yellow and brown, conchoidal fracture.

Identified November 7, 2026More sedimentary →

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Physical properties

Hardness of 7 on the Mohs scale, opaque luster, various earth tones including yellow and brown, conchoidal fracture.

Formed by the precipitation of silica from aqueous fluids in sedimentary or volcanic environments, often during ancient hydrothermal activity.

Used in ornamental carvings, cabochons, jewelry, and as decorative aggregate.

Jasper has been used since ancient times for talismans, seals, and tools due to its toughness and ability to take a high polish.

Identify by its waxy luster, hardness scratching glass, and opaque earthy colors; commonly found in riverbeds and silicate-rich rock formations.

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)