sedimentary

Jasper

Microcrystalline quartz (SiO2)

Hardness of 6.5-7 on the Mohs scale, opaque luster, various earth-tone colors due to mineral impurities, conchoidal fracture.

Identified November 13, 2026More sedimentary →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, opaque luster, various earth-tone colors due to mineral impurities, conchoidal fracture.

Formed from silica-rich fluids precipitating in sedimentary environments or volcanic rocks over millions of years.

Used extensively for ornamental carvings, cabochons in jewelry, and decorative stone items.

Jasper has been used since antiquity for talismans and seals due to its durability and rich coloration.

Identify in the field by its waxy luster, opaque appearance, and lack of visible crystal grains.

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