sedimentary

Leopard Skin Jasper

Orbicular Rhyolite (Silicon Dioxide with various impurities)

AI-generated identification · may be incorrect

Hardness: 6.5–7 Mohs; Color: Tan, cream, or pink background with distinct black, brown, or green circular spots; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific gravity: 2.58–2.91.

Hardness: 6
Luster: Vitreous to waxy

Identified April 22, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from volcanic activity (rhyolite) where silica-rich fluids filled cavities or replaced porous material, creating orbicular (circular) patterns. Despite being called jasper, it is geologically an orbicular rhyolite found in ancient volcanic flows.

Uses & applications

Primarily used for lapidary work, jewelry (beads, cabochons), ornate carvings, tumbled stones for collectors, and in metaphysical practices.

Geological facts

Also known as Jaguar Stone, it is actually a type of volcanic rock (rhyolite) that has been masquerading as a jasper for years in the gemstone market because of its high silica content and ability to take a smooth polish.

Field identification & locations

Identify by its unique 'leopard' spots that appear as rings or solid circles on a lighter matrix. It is most commonly found in Mexico. Collectors look for high contrast between the background and the spots.