sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with goethite/iron oxide inclusions
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Hexagonal (cryptocrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
Formation & geological history
Formed via the deposition of silica from water or volcanic ash, often in association with iron oxides that provide the yellow pigment. Typically dates from various eras from Precambrian to Cenozoic.
Uses & applications
Used primarily as a gemstone for jewelry, lapidary work (cabochons), and decorative carvings. Highly valued in spiritual/metaphysical communities.
Geological facts
Yellow Jasper was historically known as a 'nurturing stone.' The color comes from high concentrations of goethite or limonite. It is a variety of chalcedony that is opaque rather than translucent.
Field identification & locations
Identify by its smooth, waxy texture and inability to be scratched by a steel pocket knife. Found commonly in stream beds and desert regions of India, South Africa, and the USA (Oregon and Idaho).
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