igneous
Leopard Skin Jasper
Rhyolite (Silicon Dioxide with impurities), SiO2
Hardness: 6.5-7 (Mohs), Color: Tan, pink, and brown with orbicular leopard-like spots, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs), Color: Tan, pink, and brown with orbicular leopard-like spots, Luster: Vitreous to waxy, Crystal Structure: Trigonal (Microcrystalline), Specific Gravity: 2.6-2.9
Formation & geological history
Formed from volcanic activity where silica-rich fluids cooled rapidly, creating a fine-grained or glassy rhyolitic base with secondary mineral inclusions that create the 'spots'.
Uses & applications
Primarily used for lapidary work, jewelry (beads, cabochons), carving ornate objects, and as a decorative stone in collecting or metaphysical practices.
Geological facts
Despite being called a 'Jasper', it is geologically a form of Orbicular Rhyolite. The 'spots' are actually spherulites, which are small, needle-like crystals that grow outward from a central point during the cooling of volcanic ash or lava.
Field identification & locations
Identify by its distinctive orbicular (circular) patterns reminiscent of animal fur and its high hardness which resists scratching by steel. It is most famously found in Mexico (Chihuahua region).
