sedimentary

Leopard Skin Jasper

Silicon Dioxide (SiO2) with various inclusions

Hardness: 6.5-7 (Mohs scale), Color: Cream, tan, or pink with red/brown orbicular spots, Luster: Vitreous to waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None, Specific Gravity: 2.58-2.91

Hardness: 6

Identified June 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica-rich fluids that penetrate through volcanic or sedimentary rock, creating 'orbicular' patterns over millions of years. This piece specifically shows brecciated and orbicular qualities common in silicified gemstones.

Uses & applications

Used primarily in the lapidary arts for cabochons, beads, and carvings. Also highly popular in jewelry and as holistic 'healing stones' in alternative medicine.

Geological facts

Despite being called Jasper, it is technically an orbicular rhyolite. The 'spots' are formed when quartz and feldspar crystallize in radial patterns. It is frequently associated with the country of Mexico, where high-quality specimens are found.

Field identification & locations

Identify in the field by its distinctive 'cheetah' or 'leopard' spot pattern and high hardness (it will scratch glass). It typically has a smooth, jasper-like feel when tumbled or polished. Common locations include Mexico, Peru, and Brazil.

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Sandstone or Siltstone

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Cone-in-cone structure (Limestone)

Cone-in-cone structure (Secondary Sedimentary Structure)

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Chert Breccia

Brecciated Chert (Microcrystalline Silica)

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Sandstone Grain

Clastic Sedimentary Rock Grain (SiO2 dominated)

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Shale or Slaty Mudstone

Argillaceous sedimentary rock

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Sandstone

Arenite (primarily SiO2)

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