sedimentary

Wonderstone Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Banded patterns of cream, red, brown, and black; Luster: Waxy to dull; Crystal structure: Microcrystalline; Cleavage: None (conchoidal fracture); SG: 2.6

Hardness: 6
Color: Banded patterns of cream, red, brown, and black
Luster: Waxy to dull

Identified May 30, 2026More sedimentary →

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Physical properties

Hardness: 6.5-7 (Mohs); Color: Banded patterns of cream, red, brown, and black; Luster: Waxy to dull; Crystal structure: Microcrystalline; Cleavage: None (conchoidal fracture); SG: 2.6

Formation & geological history

Formed from volcanic ash deposits (rhyolitic tuff) that were altered by hydrothermal fluids or groundwater, resulting in rhythmic banding of iron oxide minerals. Most famous deposits are Miocene in age.

Uses & applications

Primarily used for lapidary work, including cabochons for jewelry, decorative carvings, bookends, and collection displays.

Geological facts

The unique rhythmic banding is often a result of Liesegang rings, which are chemical precipitates formed during the weathering process of the volcanic tuff.

Field identification & locations

Look for distinct, concentric or fluid-like bands of color within a dense, fine-grained rock. Commonly found in the Western United States, particularly Utah and Nevada.