igneous
Leopard Skin Jasper
Rhyolite (Silicon Dioxide with impurities), SiO2
Hardness: 6.5–7 (Mohs); Color: Mottled orange, pink, cream, and brown with black orbicular spots; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/Amorphous; Specific Gravity: 2.6–2.9.
- Hardness
- 6
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5–7 (Mohs); Color: Mottled orange, pink, cream, and brown with black orbicular spots; Luster: Vitreous to waxy; Crystal structure: Microcrystalline/Amorphous; Specific Gravity: 2.6–2.9.
Formation & geological history
Formed through the cooling of silica-rich volcanic lava (igneous) that develops orbicular spherulitic structures. While often called jasper, it is geologically a rhyolite. Typically dates to the Precambrian or later volcanic periods depending on the deposit.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular palm stone for crystal collectors and lapidary hobbyists.
Geological facts
Its name comes from its resemblance to leopard fur. Despite being called 'Jasper' in the trade, its base material is actually volcanic rhyolite, which distinguishes it from true sedimentary jaspers.
Field identification & locations
Identify by its distinctive 'leopard' spots and circular patterns. It is predominantly found in Mexico (Chihuahua region). Collectors should look for high contrast in patterns and lack of visible Cracks.
