metamorphic
Polished leopard-skin jasper
Leopard-skin jasper; an opaque, microcrystalline quartz-rich rock, commonly with iron-oxide and volcanic/mineral inclusions
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; black, tan, brown, and cream orbicular pattern; waxy to glossy polish; massive, non-cleavable cryptocrystalline texture. Composition varies, often including quartz, chalcedony, feldspar, hematite, and other silicates.
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Physical properties
Hardness about 6.5–7 Mohs; black, tan, brown, and cream orbicular pattern; waxy to glossy polish; massive, non-cleavable cryptocrystalline texture. Composition varies, often including quartz, chalcedony, feldspar, hematite, and other silicates.
Formation & geological history
Usually forms through silica-rich replacement, silicification, or alteration of volcanic rocks and breccias; exact geological age depends on locality, commonly Paleozoic to Mesozoic. This specimen is tumbled and polished.
Uses & applications
Used for cabochons, beads, carvings, palm stones, and decorative objects; valued primarily as an ornamental stone rather than a construction material.
Geological facts
The leopard-like spots are contrasting mineral-rich patches or orbicules, not animal-derived markings. “Jasper” is a broad commercial term rather than a single precisely defined mineral species.
Field identification & locations
Identify by its opaque body, multicolored spotted pattern, glassy/waxy polish, and lack of visible large crystals or cleavage; common sources include Mexico, Madagascar, Brazil, and the western United States. Acid and scratch testing should be done cautiously.
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