sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, exhibits earthy to vitreous luster, opaque appearance, and conchoidal fracture.

Identified October 17, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, exhibits earthy to vitreous luster, opaque appearance, and conchoidal fracture.

Formed through the silica-rich precipitation in marine environments or hydrothermal solutions, often consolidated over millions of years.

Commonly used for ornamental carvings, cabochons, lapidary art, and low-cost jewelry making.

Jasper has been utilized since ancient times for talismans, seals, and weapons due to its toughness and fracture properties.

Identified by its opaque nature and varied multicolored patterns; widely distributed globally in sedimentary and volcanic deposits.

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)