mineral

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Hardness: 6.5-7 on Mohs scale; Color: mustard yellow to brown; Luster: dull to vitreous; Crystal structure: hexagonal (cryptocrystalline); Cleavage: none; Specific gravity: 2.58-2.91

Hardness: 6
Color: mustard yellow to brown
Luster: dull to vitreous

Identified March 4, 2026More mineral →

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Physical properties

Hardness: 6.5-7 on Mohs scale; Color: mustard yellow to brown; Luster: dull to vitreous; Crystal structure: hexagonal (cryptocrystalline); Cleavage: none; Specific gravity: 2.58-2.91

Formation & geological history

Formed in volcanic ash or silica-rich sedimentary environments where mineral-rich water flows through cracks, depositing chalcedony. The yellow hue is caused by iron (goethite or limonite) inclusions.

Uses & applications

Primarily used for lapidary work, jewelry (cabs/beads), decorative ornaments, and as a semi-precious collector stone. Historically used for making tools and seals.

Geological facts

Ancient civilizations referred to yellow jasper as a stone of endurance and protection. It is a dense, opaque variety of chalcedony that does not transmit light even when held to a source.

Field identification & locations

Identify in the field by its opacity, smooth waxy texture when wet, and lack of visible crystalline grain. Commonly found in riverbeds, desert washes, and volcanic regions globally.

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