sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including brown and red, trigonal crystal system with conchoidal fracture.

Identified November 6, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, various earth tones including brown and red, trigonal crystal system with conchoidal fracture.

Formed from silica-rich fluids precipitating in sedimentary environments or hydrothermal veins, often associated with volcanic ash.

Used widely in ornamental carvings, jewelry, lapidary arts, and as decorative stone.

Jasper has been utilized since ancient times for talismans and seals, revered across many early civilizations for its striking patterns.

Identified easily by its opaque nature, waxy luster, and smooth conchoidal breakage, 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)