sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Mustard yellow, golden brown, tan; Luster: Vitreous to waxy (when polished); Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Opaque.
- Hardness
- 6
- Color
- Mustard yellow, golden brown, tan
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow, golden brown, tan; Luster: Vitreous to waxy (when polished); Structure: Microcrystalline quartz; Cleavage: None/Conchoidal fracture; Opaque.
Formation & geological history
Formed through the deposition of silica from water in sedimentary environments where iron oxides (goethite or limonite) provide the yellow coloration. Often found in volcanic ash beds or hydrothermal veins.
Uses & applications
Primarily used as a gemstone in jewelry (pendants, beads), as decorative ornaments, and widely collected for its varied banding and patterns.
Geological facts
Yellow Jasper was historically considered a 'stone of protection' by ancient civilizations during physical and spiritual journeys. The banding seen in this specimen is typical of 'picture jasper' varieties.
Field identification & locations
Identified by its opaque nature, lack of cleavage, and characteristic mustard hue. Unlike yellow glass, it will not have air bubbles and feels colder to the touch. Commonly found in South Africa, Brazil, and the Western USA.
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