sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, massive crystal structure with conchoidal fracture, and specific gravity around 2.65.

Identified November 2, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque luster, massive crystal structure with conchoidal fracture, and specific gravity around 2.65.

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

Widely utilized for ornamental carvings, cabochons, jewelry making, and collected as a decorative lapidary stone.

Jasper has been used since ancient times for talismans, seals, and weaponry due to its durability and rich coloration.

Easily identified by its opaque appearance, waxy luster, and lack of cleavage; commonly found in riverbeds and ancient alluvial deposits 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)