sedimentary

Yellow Jasper

Silicon Dioxide (SiO2)

Hardness: 6.5-7 Mohs; Color: Mustard yellow to brownish-yellow; Luster: Dull, earthy, or waxy; Crystal structure: Trigonal/Microcrystalline; Opaque or slightly translucent; Cleavage: None (conchoidal fracture).

Hardness: 6
Color: Mustard yellow to brownish-yellow
Luster: Dull, earthy, or waxy

Identified July 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the deposition of silica-rich fluids in sedimentary environments or volcanic ash. The yellow color is primarily due to goethite or other iron hydroxide inclusions. Geological age varies greatly from Precambrian to Cenozoic.

Uses & applications

Primarily used for lapidary work including tumbled stones, jewelry beads, cabochons, and ornamental carvings. Historically used for seals and building materials.

Geological facts

Yellow Jasper has been used by ancient civilizations for centuries as a protective stone. It is often referred to as a 'stone of endurance' and was used by Egyptian and Native American cultures.

Field identification & locations

Identified by its mustard-yellow color, extreme hardness (will scratch glass), and smooth, shell-like fracture pattern. Commonly found in riverbeds and coastal regions in India, Russia, Brazil, and the USA.