igneous
Leopard jasper (likely orbicular rhyolite)
Silica-rich rhyolite, chiefly quartz and feldspar with iron/manganese oxides; jasper is microcrystalline quartz (SiO₂)
AI-generated identification · may be incorrectTypically opaque gray, cream, and brown with mottled or orbicular patterns; dull to waxy luster, no visible cleavage, conchoidal fracture, and hardness about 6.5–7 Mohs. The image suggests a weathered or polished fine-grained specimen.
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Physical properties
Typically opaque gray, cream, and brown with mottled or orbicular patterns; dull to waxy luster, no visible cleavage, conchoidal fracture, and hardness about 6.5–7 Mohs. The image suggests a weathered or polished fine-grained specimen.
Formation & geological history
Formed from silica-rich volcanic lava or ash that cooled and later underwent silicification, producing jasper-like textures; commonly Cenozoic to older volcanic material. Exact age cannot be determined visually.
Uses & applications
Used as ornamental stone, cabochons, carvings, polished stones, and lapidary material; generally not used structurally.
Geological facts
“Leopard jasper” is a commercial lapidary name rather than a single strictly defined mineral species. Similar-looking material may also be called orbicular jasper or rhyolite.
Field identification & locations
Identify by its opaque hardness, fine-grained texture, irregular spots, and resistance to scratching by steel; acid produces no fizz. Common sources include Mexico, Madagascar, Oregon, and other volcanic regions.
