sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5-7 on the Mohs scale, opaque yellow to brown color, waxy luster, and conchoidal fracture.

Identified November 13, 2026More sedimentary →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, opaque yellow to brown color, waxy luster, and conchoidal fracture.

Formed through the precipitation of silica-rich fluids in sedimentary or volcanic environments over millions of years.

Used primarily in lapidary arts, ornamental carvings, jewelry making, and as a collector specimen.

Jasper is an aggregate of microgranular quartz and up to 20% foreign materials, which account for its varied colors.

Identify by its opacity, lack of cleavage, and smooth waxy feel; commonly found in riverbeds and ancient hydrothermal veins worldwide.

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

Sandstone or Siltstone

Arenite (if sandstone)

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Shale

Fissile Sedimentary Rock

Sandstone

Arenite

Shale

Clastic sedimentary rock