sedimentary

Tiger Jasper (Polychrome Jasper)

Silicon Dioxide (SiO2) with iron oxide and other mineral inclusions

Hardness: 6.5-7 on Mohs scale. Color: Multicolor swirls of red, brown, tan, and grey. Luster: Vitreous to dull (waxy when polished). Crystal structure: Trigonal/Microcrystalline. Specific gravity: 2.58-2.91.

Hardness: 6
Color: Multicolor swirls of red, brown, tan, and grey
Luster: Vitreous to dull (waxy when polished)

Identified June 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the deposition of silica from water or volcanic ash, which then undergoes silicification. The distinct colors are created by iron oxides (hematite and goethite) and clay inclusions during the lithification process.

Uses & applications

Primarily used for lapidary work, cabochons, interior decor carvings, and gemstone therapy/collecting. It is highly valued for its aesthetic, 'desert-landscape' appearance.

Geological facts

Also known as Desert Jasper, it was first discovered in Madagascar in 2008. It is unique because it forms in massive formations rather than crystals, allowing for large, stunning sculptural pieces.

Field identification & locations

Identify in the field by its opaque, multicolored bands and high hardness (it will not be scratched by a steel knife). Commonly found in Madagascar, particularly in the Norcross area.

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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

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Sandstone

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