sedimentary

Polished mookaite jasper

Mookaite (silicified radiolarian sediment; predominantly microcrystalline quartz/chalcedony, SiO₂)

AI-generated identification · may be incorrect

Opaque, polished pebble with mustard-yellow, cream, red, and dark brown patches. Quartz-rich material is about Mohs 6.5–7, with a waxy to vitreous luster and no visible cleavage; its texture and specific gravity vary with impurities.

Identified October 15, 2026More sedimentary →

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Physical properties

Formation & geological history

A silicified sedimentary material formed when silica replaced or cemented microscopic marine fossils and sediment, likely during the Cretaceous. It is best known from the Mooka Creek area of Western Australia.

Uses & applications

Used for beads, cabochons, carvings, and ornamental objects; also collected as a decorative lapidary stone.

Geological facts

The trade name refers to Mooka Creek, where colorful jasper-like material occurs; its striking bands and patches come from iron-rich impurities.

Field identification & locations

Identify by its opaque, multicolored patterns and smooth polish; confirmatory testing or locality information is needed because many jaspers look similar. Commonly sourced from Western Australia.