sedimentary

Zebra Stone

Siltstone (Argillaceous Siltstone)

Hardness: 3-4 (Mohs scale), Color: Alternating white, tan, and dark brown/black stripes, Luster: Dull/Earthy to waxy (when polished), Structure: Fine-grained clastic, SG: 2.6-2.8.

Identified July 13, 2026More sedimentary →

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Physical properties

Hardness: 3-4 (Mohs scale), Color: Alternating white, tan, and dark brown/black stripes, Luster: Dull/Earthy to waxy (when polished), Structure: Fine-grained clastic, SG: 2.6-2.8.

Formation & geological history

Formed over 600 million years ago during the Precambrian period. It is a sedimentary rock often found in the Kimberley region of Western Australia, formed by the deposition of clay-rich sediments and secondary mineralization of iron oxides.

Uses & applications

Primarily used for ornamental purposes, including beads, cabochons for jewelry, small carvings, figurines, and as decorative tumbled stones.

Geological facts

The distinct banding is believed to be a result of rhythmic precipitation of iron oxide (hematite) during the alteration of the rock by mineral-rich fluids. No two pieces are exactly alike in their pattern.

Field identification & locations

Identify by its unique zebra-like stripes of contrasting colors. Most authentic specimens come from the Kununurra area in Western Australia. Collectors find it relatively easy to tumble and polish.