sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) with iron and manganese inclusions
Hardness: 6.5-7 (Mohs scale), Color: pinkish-brown with orbicular or spotted patterns of dark brown and tan, Luster: dull to vitreous, Crystal structure: microcrystalline trigonal
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: pinkish-brown with orbicular or spotted patterns of dark brown and tan, Luster: dull to vitreous, Crystal structure: microcrystalline trigonal
Formation & geological history
Formed through the accumulation of volcanic ash or silicate sediments that were later silicified. The distinctive spotting (orbicular patterns) is caused by the localized diffusion of mineral impurities during the hardening process.
Uses & applications
Primarily used for lapidary work, jewelry making (cabochons and beads), decorative carvings, and as a popular specimen for metaphysical collectors.
Geological facts
Despite being called a jasper, it is often technically an orbicular rhyolite. It is famously associated with the 'jaguar' or 'leopard' because of its visual resemblance to spotted wild cats.
Field identification & locations
Identify by its characteristic 'spotted' or blotchy pattern against a tan or reddish-brown base. It is frequently found in Mexico and Peru. Collectors look for high contrast in the spots and a smooth, waxy surface when polished.
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