sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony
Hardness: 6.5-7 (Mohs scale); Color: Yellow to mustard-yellow; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow to mustard-yellow
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Yellow to mustard-yellow; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of volcanic ash or silica-rich sediments. The yellow color is derived from iron inclusions (limonite or goethite) during the deposition process.
Uses & applications
Polished for jewelry, cabochons, decorative carvings, and as a popular stone for tumbling and collecting.
Geological facts
Yellow Jasper was historically used by ancient civilizations as a protective talisman during travel. It belongs to the chalcedony family, which includes carnelian, agate, and onyx.
Field identification & locations
Identify by its opaque quality (does not let light through even at edges), yellow-gold hue, and smooth, waxy surface when polished. Found worldwide with major deposits in India, Russia, Brazil, and the USA.
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