sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, waxy luster, opaque, and comes in various earth tones such as yellow, brown, and red.

Identified November 7, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, waxy luster, opaque, and comes in various earth tones such as yellow, brown, and red.

Formed through the precipitation of silica-rich fluids in sedimentary basins or volcanic environments over millions of years.

Used primarily in lapidary arts, ornamental carvings, and jewelry making.

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

Identified by its opaque appearance, conchoidal fracture, and lack of crystal faces; 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)