sedimentary

Jasper

Microcrystalline quartz (SiO2)

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

Identified November 12, 2026More sedimentary →

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Physical properties

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

Formed from silica-rich solutions precipitating in marine or volcanic environments, often through the alteration of sedimentary rocks.

Used in ornamental carvings, jewelry, and polished lapidary specimens.

Jasper has been utilized since ancient times for talismans, seals, and weaponry components due to its toughness and aesthetic appeal.

Identify by its waxy luster, lack of crystal visibility, and inability to be scratched by steel; commonly found 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

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)