mineral

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Hardness: 6.5–7 on the Mohs scale. Color: Mustard yellow to golden brown. Luster: Vitreous to waxy. Crystal Structure: Hexagonal (microcrystalline). Cleavage: None (conchoidal fracture). Specific Gravity: 2.58–2.91.

Hardness: 6
Color: Mustard yellow to golden brown
Luster: Vitreous to waxy

Identified March 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the infiltration of silica-rich fluids into volcanic ash or sedimentary rocks. The yellow coloration specifically comes from iron hydroxide inclusions (goethite). It can be found in formations dating from the Precambrian to more recent eras.

Uses & applications

Commonly used in lapidary work for cabochons, beads, and carvings. It is also used in decorative mosaics and as a protection stone in metaphysical practices.

Geological facts

Jasper is an opaque variety of chalcedony. Historically, it was known as the 'rain bringer' in Native American cultures and was often used to carve amulets for protection. Its name comes from the Greek word 'iaspis', meaning spotted stone.

Field identification & locations

Identify in the field by its opacity (it does not transmit light even on thin edges), its smooth waxy feel when tumbled, and its inability to be scratched by a steel knife. Common locations include South Africa, India, and the Western United States (Oregon/Idaho).

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