sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5-7 on the Mohs scale, red to brown or multicolored hues, vitreous to dull luster, and conchoidal fracture with no visible cleavage.

Identified November 8, 2026More sedimentary →

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Physical properties

Hardness of 6.5-7 on the Mohs scale, red to brown or multicolored hues, vitreous to dull luster, and conchoidal fracture with no visible cleavage.

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

Used extensively for ornamental carvings, cabochons, jewelry, and as decorative facing stone.

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

Identify by its opaque nature, waxy luster, and resistance to steel scratching; 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)