sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 Mohs; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9
- Hardness
- 6
- Color
- Mustard yellow to golden brown
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Mustard yellow to golden brown; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific gravity: 2.6-2.9
Formation & geological history
Formed through the deposition of silica from water-rich environments, often in volcanic or sedimentary processes where iron impurities provide the distinct yellow hue. Common in regions with high volcanic activity or ancient seabed deposits.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and decorative carvings. It is also used as an ornamental stone and is highly popular in the metaphysical community as a 'stone of protection.'
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone.' Yellow Jasper specifically gets its color from the presence of goethite or iron oxides.
Field identification & locations
Identify in the field by its opacity (unlike translucent quartz), waxy texture when polished, and high hardness. It is commonly found in riverbeds, beaches, and desert plains, especially in areas like Brazil, Madagascar, and the USA.
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