sedimentary

Jasper

Microcrystalline Quartz (SiO2)

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

Identified October 18, 2026More sedimentary →

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Physical properties

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

Formed from silica-rich solutions precipitating in sedimentary environments or volcanic ash beds, often dating from the Precambrian to Cenozoic eras.

Used primarily in ornamental carvings, cabochons, jewelry, and as a popular specimen for mineral collectors.

Jasper has been used since ancient times for talismans, seals, and weaponry components due to its toughness and fracture properties.

Identify by its waxy luster, conchoidal fracture, and opaque earthy colors; commonly found in riverbeds and mountainous regions 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

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)