sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5-7 on the Mohs scale, opaque luster, massive crystal structure with no visible cleavage, and a specific gravity around 2.65.

Identified October 29, 2026More sedimentary →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, opaque luster, massive crystal structure with no visible cleavage, and a specific gravity around 2.65.

Formed by the precipitation of silica-rich fluids in sedimentary or volcanic environments, often during ancient hydrothermal activity.

Commonly used for ornamental carvings, cabochons, jewelry, and polished display specimens.

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

Identified by its waxy luster, conchoidal fracture, and varied opaque coloration; 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)