sedimentary

Jasper

Microcrystalline Quartz (SiO2)

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

Identified November 9, 2026More sedimentary →

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Physical properties

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

Formed by the precipitation of silica-rich fluids in sedimentary environments or hydrothermal veins, often dating back over 500 million years.

Commonly used in ornamental carvings, cabochons, jewelry, and polished collector specimens.

Jasper has been utilized since ancient times for talismans and seals due to its durability and rich color patterns.

Easily identified by its opaque nature and waxy luster, frequently found in riverbeds, gravel deposits, and hydrothermal zones 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)