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The term 'Mookaite' is an unofficial, locally coined name for a silicified porcelanite which forms in the weathering profile of a geological formation known as Windalia Radiolarite (WR), a Lower Cretaceous siltstone that outcrops over much of the Carnarvon Basin in Western Australia.
Mookaite is variously, and incorrectly, described as chert, opalite, chalcedony or combinations of the three.
From a strictly geological perspective however, Mookaite is best defined as a silicified type of WR whose silification is opaline to chalcedonic.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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Locality Updated: Shin-Otani mine, Ukyou-ku, Kyoto Prefecture, Kinki Region, Honshu Island, JapanFrom Hiroaki Tano, 22nd May 2013 11:37:03