sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Mustard yellow to brownish-yellow
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Vitreous to waxy; Structure: Microcrystalline/Cryptocrystalline (Trigonal); Cleavage: None (Conchoidal fracture); Specific Gravity: 2.58–2.91
Formation & geological history
Formed from the deposition of silica from water solutions or volcanic ash in sedimentary environments, often influenced by the presence of Goethite or Limonite which provide the yellow hue.
Uses & applications
Extensively used as a gemstone in lapidary work (cabochons, beads), decorative carvings, and as a popular 'healing stone' in metaphysical collections.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek word 'iaspis', meaning spotted stone, though yellow jasper is often more uniform in color than other varieties.
Field identification & locations
Identify in the field by its smooth, waxy texture when tumbled and its inability to be scratched by a steel knife. Commonly found in riverbeds and coastal regions globally, notably in India, Russia, and the USA.
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