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Radiolarite or radiolarian chert is a high silica sedimentary rock which may be considered a variety of chert. It is formed as primary deposits and contains radiolarian microfossils. Radiolarite indicates deep water deposition below the lysocline where siliceous sediments are stable and carbonates are dissolved.

The Windalia radiolarite is a Cretaceous formation in Western Australiamarker. The formation contains abundant foraminifera, radiolaria and calcareous nanoplankton fossils. Locally the varicolored opaline to chalcedonic radiolarite is mined and used as an ornamental stone termed mookaite.

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