sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) with various inclusions
Hardness: 6.5-7 (Mohs); Color: Tan and brown with dark green or black 'leopard' spots/streaks; Luster: Dull/Waxy; Structure: Microcrystalline quartz; Cleavage: None
- Hardness
- 6
- Luster
- Dull/Waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Tan and brown with dark green or black 'leopard' spots/streaks; Luster: Dull/Waxy; Structure: Microcrystalline quartz; Cleavage: None
Formation & geological history
Formed from the deposition of microcrystalline quartz as mineral-rich fluids permeated cracks in volcanic rocks or sedimentary beds. The patterns result from chemical precipitation during the solidification process.
Uses & applications
Commonly used for lapidary work, jewelry (cabochons and beads), decorative ornaments, and as a popular stone for balancing and grounding in holistic practices.
Geological facts
Despite being called 'jasper', this specific specimen (often called Orbicular Jasper) is technically an igneous rhyolite that has been heavily silicified, giving it the appearance and hardness of jasper.
Field identification & locations
Identify in the field by its distinct spotted or 'orbicular' pattern and high hardness (it will scratch glass). Commonly found in Mexico, Peru, and parts of Brazil. Smooth, water-worn pebbles are often found in riverbeds.
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