mineral
Polished leopard jasper
Rhyolitic jasper/chalcedony aggregate, commonly sold as leopard jasper
AI-generated identification · may be incorrectTypically opaque reddish-brown microcrystalline quartz with yellow-orange iron-oxide or feldspar-rich spots; Mohs hardness about 6.5–7, vitreous to waxy luster, no visible cleavage, and conchoidal fracture. The specimen is rounded and highly polished, so surface appearance is enhanced.
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Physical properties
Typically opaque reddish-brown microcrystalline quartz with yellow-orange iron-oxide or feldspar-rich spots; Mohs hardness about 6.5–7, vitreous to waxy luster, no visible cleavage, and conchoidal fracture. The specimen is rounded and highly polished, so surface appearance is enhanced.
Formation & geological history
Forms when silica-rich volcanic fluids replace or fill cavities in rhyolitic volcanic rock, with iron staining producing the spotted pattern; commonly Cenozoic to older volcanic-hosted material. The exact locality cannot be confirmed from the image.
Uses & applications
Used as a lapidary stone for cabochons, beads, carvings, palm stones, and decorative objects; generally valued for pattern and polish rather than rarity.
Geological facts
“Leopard jasper” is a commercial lapidary name rather than a single precisely defined mineral species; similar material may be marketed as leopard skin jasper or rhyolite jasper.
Field identification & locations
Identify it by its opaque red-brown body, contrasting yellow spots, fine-grained texture, and inability to scratch glass only if the surface is uncoated; common sources include Mexico, Madagascar, and western United States. Avoid acids and test inconspicuous areas because polishing or coatings can affect results.
