mineral
Polished leopard-skin jasper
Orbicular jasper; microcrystalline quartz/chalcedony (SiO₂) with iron-oxide inclusions
AI-generated identification · may be incorrectMohs hardness about 6.5–7; dark brown to reddish-black groundmass with orange, rounded orbicular patterns; opaque, vitreous to waxy luster, cryptocrystalline structure, and no visible cleavage. The wire wrap is non-geological jewelry hardware.
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Physical properties
Mohs hardness about 6.5–7; dark brown to reddish-black groundmass with orange, rounded orbicular patterns; opaque, vitreous to waxy luster, cryptocrystalline structure, and no visible cleavage. The wire wrap is non-geological jewelry hardware.
Formation & geological history
Forms when silica-rich volcanic or hydrothermal material is replaced and patterned by iron- and manganese-bearing fluids; individual deposits are generally Tertiary or older, depending on locality. Commonly associated with volcanic terrains, especially Mexico and the western United States.
Uses & applications
Used for cabochons, pendants, beads, carvings, and decorative objects; durable but not usually considered a high-value gemstone.
Geological facts
“Leopard jasper” is a commercial name rather than a single formally defined mineral species; similar orbicular patterns may be sold as ocean jasper or other patterned jasper.
Field identification & locations
Identify by its opaque silica-rich body, rounded contrasting spots, hardness, and lack of cleavage; it will not fizz in dilute acid and typically scratches glass. Exact identification requires locality information because patterned jaspers overlap visually.
