mineral

Yellow Jasper

Silicon Dioxide (SiO2) with Iron Hydroxide impurities

Hardness: 6.5-7 on Mohs scale; Color: Golden yellow, mustard yellow, to brownish-yellow; Luster: Vitreous to waxy when polished; Crystal Structure: Trigonal (microcrystalline quartz/chalcedony); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Golden yellow, mustard yellow, to brownish-yellow
Luster: Vitreous to waxy when polished

Identified July 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluid precipitates within cracks, cavities, and sedimentary or volcanic environments, absorbing goethite or other iron oxides that impart its distinct yellow hue.

Uses & applications

Used extensively as a decorative gemstone, in tumbled stones, cabochons, beaded jewelry, carvings, and as a popular specimen for rock collectors.

Geological facts

Yellow jasper derives its warm color from fine inclusions of iron oxide minerals like goethite or limonite. Historically, jasper has been used since antiquity for seals, amulets, and ornamental art.

Field identification & locations

Identified by its rich yellow-to-brown opaque body, smooth waxy polish, and high hardness (scratches glass). It is commonly found in India, Russia, Madagascar, South Africa, and the western United States.

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