sedimentary
Yellow Jasper
Chalcedony (SiO2 with iron oxide inclusions)
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Hexagonal/Trigonal (Microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Vitreous to waxy, Crystal Structure: Hexagonal/Trigonal (Microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91
Formation & geological history
Forms when silica-rich fluids precipitate through sedimentary rocks or volcanic ash, with the yellow hue derived from high concentrations of goethite or iron oxides. Often found in hydrothermal veins or as river-tumbled nodules.
Uses & applications
Used primarily as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock tumbling and crystal healing practices.
Geological facts
Jasper is known as the 'supreme nurturer' in metaphysical circles. It is an opaque variety of chalcedony, meaning even thin slices do not allow light to pass through, which distinguishes it from agate.
Field identification & locations
Identified in the field by its opacity, smooth conchoidal fracture, and inability to be scratched by a steel knife. Common in diverse locations such as India, Russia, Brazil, and the Southwestern USA.
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