sedimentary

Jasper

Silicon Dioxide (Microcrystalline Quartz)

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

Formed through the silification of sedimentary or volcanic deposits, often precipitating from silica-rich hydrothermal fluids.

Commonly utilized in lapidary arts for making cabochons, beads, ornamental carvings, and jewelry.

Jasper has been used since ancient times for talismans and seals, with mentions in various historical texts.

Easily identified by its opaque nature and fine-grained texture; found worldwide 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

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)