File:Mookaite (Windalia Radiolarite Formation, Lower Cretaceous; Western Australia) 1 (46509508711).jpg

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Mookaite from the Cretaceous of Western Australia. (~13.3 centimeters across at its widest)

Mookaite is a silicified sedimentary rock from the Lower Cretaceous 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.

The yellowish and reddish colors are from iron oxide impurities (limonite and hematite).
Date
Source Mookaite (Windalia Radiolarite Formation, Lower Cretaceous; Western Australia) 1
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/46509508711 (archive). It was reviewed on 28 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

28 November 2019

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Date/TimeThumbnailDimensionsUserComment
current21:05, 28 November 2019Thumbnail for version as of 21:05, 28 November 20193,315 × 2,346 (3.34 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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