igneous
Rhyolite (Leopard Skin Jasper)
Rhyolite (Silicon Dioxide with impurities)
Hardness: 6.5-7 Mohs; Color: Tan, cream, pink, and brown with distinct orbicular spotting; Luster: Dull to waxy; Texture: Fine-grained aphanitic with orbicular inclusions; Cleavage: None.
- Hardness
- 6
- Color
- Tan, cream, pink, and brown with distinct orbicular spotting
- Luster
- Dull to waxy
Identified More igneous →
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Physical properties
Hardness: 6.5-7 Mohs; Color: Tan, cream, pink, and brown with distinct orbicular spotting; Luster: Dull to waxy; Texture: Fine-grained aphanitic with orbicular inclusions; Cleavage: None.
Formation & geological history
Formed from rapid cooling of silica-rich volcanic lava. The 'leopard' spots are typically orbicular inclusions formed during the cooling process or secondary mineralization in gas bubbles.
Uses & applications
Primarily used for lapidary work, jewelry (beads, cabochons), ornamental carvings, and as a decorative stone in collecting.
Geological facts
Despite being called 'Jasper' in the gemstone trade, it is technically a variety of Rhyolite, an extrusive igneous rock. The circular patterns are often composed of quartz and feldspar.
Field identification & locations
Identified by its distinctive leopard-like spots and hardness. Commonly found in Mexico and Peru. Collectors should look for high contrast in the spotting.
