sedimentary
Leopard Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
Hardness of 6.5 to 7 on the Mohs scale, colors ranging from tan, brown, beige, and cream with distinctive darker spots or rosettes, opaque luster, trigonal crystal system, conchoidal fracture with no true cleavage.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, colors ranging from tan, brown, beige, and cream with distinctive darker spots or rosettes, opaque luster, trigonal crystal system, conchoidal fracture with no true cleavage.
Formation & geological history
Formed from silica-rich fluids precipitating in volcanic or sedimentary environments, where mineral-rich solutions seep into fractures and cavities over millions of years, often during the Cenozoic or older geological eras.
Uses & applications
Used primarily for ornamental items, polished stones, cabochons for jewelry, and as a popular specimen for rock and mineral collectors.
Geological facts
The distinctive spots and patterns on leopard jasper are caused by mineral inclusions such as iron oxides and manganese, which crystallize in repeating orbicular patterns reminiscent of animal prints.
Field identification & locations
Easily identified by its smooth, water-worn texture when found in riverbeds, combined with its characteristic spotted brown and tan patterns. Commonly sourced from regions in Mexico, Brazil, and parts of Africa.
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