sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Vitreous to waxy, Structure: Microcrystalline/Cryptocrystalline, No cleavage, SG: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to golden brown, Luster: Vitreous to waxy, Structure: Microcrystalline/Cryptocrystalline, No cleavage, SG: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sediments, with iron inclusions providing the yellow hue. Common in sedimentary deposits and volcanic environments.
Uses & applications
Used primarily in lapidary work, jewelry (cabochons, beads), decorative carvings, and as a popular stone for tumbling and meditation.
Geological facts
Jasper is known as the 'supreme nurturer' in folklore. Yellow Jasper specifically gets its color from the presence of goethite or limonite. It was highly prized in ancient civilizations for its protective qualities.
Field identification & locations
Identify by its opaque nature, smooth conchoidal fracture, and inability to be scratched by a steel knife. Frequently found in riverbeds, deserts, and coastal areas globally.
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