sedimentary
Leopard Skin Jasper
Rhyolite (Silicon Dioxide - SiO2 with impurities)
Hardness: 6.5-7 Mohs; Color: Tan, brown, and black spots; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.6-2.9
- Hardness
- 6
- Color
- Tan, brown, and black spots
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 Mohs; Color: Tan, brown, and black spots; Luster: Vitreous to dull; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.6-2.9
Formation & geological history
Formed from volcanic flows rich in silica, where mineral impurities create orbicular or spotted patterns during the cooling and solidification process. Commonly Proterozoic to Cenozoic in age.
Uses & applications
Primarily used for lapidary work, including cabochons, beads, and decorative carvings; also popular in crystal healing and rock collecting.
Geological facts
Despite the name jasper, it is technically an orbicular rhyolite. The distinct spots resemble a leopard's coat, giving it its popular trade name.
Field identification & locations
Identify by the distinctive circular or 'leopard' spots and a waxy/glassy feel when polished. Commonly found in Mexico, Brazil, and Africa.
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