mineral
Polished yellow jasper or serpentine bead
Jasper: microcrystalline quartz (SiO₂); possible serpentine: Mg₃Si₂O₅(OH)₄
AI-generated identification · may be incorrectOpaque, mustard-yellow, waxy to faintly vitreous luster; likely hardness 3–7 depending on composition, with no visible cleavage. The spherical, highly polished form is human-shaped geological material.
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Physical properties
Opaque, mustard-yellow, waxy to faintly vitreous luster; likely hardness 3–7 depending on composition, with no visible cleavage. The spherical, highly polished form is human-shaped geological material.
Formation & geological history
Yellow jasper forms when silica-rich fluids replace or cement sediments, commonly with iron staining; serpentine forms by hydrothermal alteration of ultramafic rock. Precise age and identity cannot be established from the photograph.
Uses & applications
Used for beads, cabochons, carvings, and inexpensive jewelry; jasper is also used decoratively and occasionally as a lapidary material.
Geological facts
The smooth surface and uniform color indicate tumbling and polishing rather than a natural crystal face. A steel scratch test and streak test can help distinguish jasper from softer yellow minerals.
Field identification & locations
Common sources include India, Madagascar, Brazil, South Africa, and the United States. Jasper generally scratches glass, whereas serpentine usually does not; avoid destructive testing if it is jewelry.
