sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal) microcrystalline; Opaque appearance; Specific Gravity: 2.6-2.9.
- 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; Crystal structure: Hexagonal (trigonal) microcrystalline; Opaque appearance; Specific Gravity: 2.6-2.9.
Formation & geological history
Formed through the infiltration of silica-rich waters into sedimentary or volcanic material, where silica precipitates and hardens. Usually found in ancient sedimentary beds or as rounded pebbles in stream deposits.
Uses & applications
Commonly used in jewelry as cabochons or beads, for decorative carvings, and in alternative healing practices as a 'nurturing' stone. Historically used for making tools due to its conchoidal fracture.
Geological facts
Yellow jasper is often referred to as a 'stone of protection' in metaphysical circles. Its yellow hue is primarily derived from high concentrations of iron hydroxide minerals like goethite.
Field identification & locations
Identify by its opacity (unlike translucent citrine), its hardness (will scratch glass), and its smooth, rounded river-worn texture in this specific specimen. Commonly found in South Africa, USA, and India.
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