sedimentary
Yellow Jasper Sphere
Microcrystalline Quartz (SiO2 with iron oxide/hydroxide impurities)
AI-generated identification · may be incorrectHardness 6.5-7 on Mohs scale; opaque mustard-yellow to honey-brown; vitreous to waxy luster; conchoidal fracture.
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Physical properties
Hardness 6.5-7 on Mohs scale; opaque mustard-yellow to honey-brown; vitreous to waxy luster; conchoidal fracture.
Formation & geological history
Formed from silica precipitation in sedimentary cavities or volcanic ash flows enriched with iron oxyhydroxides.
Uses & applications
Commonly carved and polished into decorative spheres, cabochons, tumbled stones, and meditation or lapidary items.
Geological facts
Jasper spheres are created by multi-axis grinding of rough chunks, with the golden-yellow color typically caused by goethite inclusions.
Field identification & locations
Identifiable by its opaque body, high polish, resistance to scratching with a steel nail, and absence of light transmission. Widely sourced globally, including South Africa, Brazil, and the USA.
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