Image: Mookaite (Windalia Radiolarite Formation, Lower Cretaceous; Western Australia)
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Description: Mookaite from the Lower Cretaceous of Western Australia. (~13.3 centimeters across at its widest) Mookaite is a silicified sedimentary rock from the Windalia Radiolarite Formation, a succession of moderately deep marine siltstones and cherts that contain numerous microfossils of foraminifera, radiolarians, and coccoliths. Because this rock is hard, very fine-grained, and attractively colored, mookaite is valued as knapping material by flintknappers.
Author: James St. John
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