sedimentary

Yellow Jasper

Microcrystalline Quartz (SiO2)

Hardness of 6.5 to 7 on the Mohs scale, opaque yellow to brownish-yellow color, waxy to vitreous luster, microcrystalline (cryptocrystalline) crystal structure, conchoidal fracture, specific gravity around 2.58 to 2.91.

Identified August 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms in sedimentary environments through the deposition of silica-rich fluids or volcanic ash in marine or terrestrial basins, often replacing other minerals (silicification). Geological age varies widely from Precambrian to Cenozoic.

Uses & applications

Used for making jewelry, ornamental carvings, polished cabochons, and as a popular specimen for rock and mineral collectors.

Geological facts

Yellow jasper is a variety of chalcedony. The characteristic yellow color is typically caused by iron oxide inclusions within the silica matrix. Throughout history, ancient civilizations used jasper for talismans, seals, and weaponry like arrowheads.

Field identification & locations

Identified by its distinctive yellow color, opaque nature, waxy luster, and hard conchoidal edges. Common locations include riverbeds, desert regions, and areas with ancient volcanic or sedimentary activity worldwide, especially in the USA, India, Madagascar, and Brazil.