mineral

Polished leopard jasper

Rhyolitic jasper/chalcedony aggregate, commonly sold as leopard jasper

AI-generated identification · may be incorrect

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.

Identified September 7, 2026More mineral →

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Physical properties

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.