sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Hardness of 6.5 to 7 on the Mohs scale, opaque yellow to brownish-yellow color, waxy to vitreous luster, and microcrystalline quartz structure.

Identified November 6, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, opaque yellow to brownish-yellow color, waxy to vitreous luster, and microcrystalline quartz structure.

Formed by the precipitation of silica from thermal waters or silica-rich sediments, often in marine environments, over millions of years.

Used primarily in lapidary work, decorative carvings, cabochons, and as a popular tumbled stone for collectors.

Jasper has been used since ancient times for talismans, seals, and weaponry components by various civilizations worldwide.

Identified by its conchoidal fracture, lack of cleavage, and resistance to steel scratching; commonly found 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)