sedimentary

Jasper

Microcrystalline quartz (SiO2)

Hardness of 6.5-7 on the Mohs scale, opaque luster, featuring red, brown, and yellow hues with a conchoidal fracture.

Identified November 13, 2026More sedimentary →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, opaque luster, featuring red, brown, and yellow hues with a conchoidal fracture.

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

Used primarily for ornamental carvings, polished tumbled stones, cabochons for jewelry, and lapidary collections.

Ancient civilizations used jasper for talismans and seal amulets due to its durability and striking earthy patterns.

Identified by its opaque appearance, smooth waxy polish, and lack of cleavage; found globally 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

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