sedimentary
Leopard Skin Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
Hardness: 6.5-7. Color: Tan to cream with brown or reddish spotted patterns. Luster: Vitreous to dull. Structure: Microcrystalline. Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Tan to cream with brown or reddish spotted patterns
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7. Color: Tan to cream with brown or reddish spotted patterns. Luster: Vitreous to dull. Structure: Microcrystalline. Cleavage: None (conchoidal fracture).
Formation & geological history
Formed via the deposition of silica-rich fluids (often in volcanic or sedimentary environments) where mineral impurities like iron or manganese create orbicular or spotted patterns during cooling or cementation.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons and beads), carvings, and as a popular stone for crystal healing and mineral collecting.
Geological facts
Despite being called 'Jasper', it is technically a form of Rhyolite (an igneous rock) or a silicified sedimentary rock depending on the specific deposit. The spots are known as 'orbicules'.
Field identification & locations
Identified by its distinctive leopard-like spots and hardness. Commonly found in Mexico (specifically Chihuahua) and Brazil. To identify in the field, look for high hardness and non-transparent, spotted patterns.
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