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Book Chapter

The Geology, Mineralogy and Exploitation of Halloysite Clays of Northland, New Zealand

By
Colin C. Harvey
Colin C. Harvey
Department of Geological Sciences, Indiana University, 1005 E. Tenth St., Bloomington, IN 47405
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Haydn H. Murray
Haydn H. Murray
Department of Geological Sciences, Indiana University, 1005 E. Tenth St., Bloomington, IN 47405
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Published:
January 01, 1993

Abstract

In Northland, New Zealand, several large deposits of hydrated halloysite clay have been formed by the in situ alteration of rhyolite volcanics of Pliocene or Pleistocene age. The rhyolites were erupted through pre-Pliocene sedimentary strata and locally through basalt. They are onlapped in places by more recent basalt flows. The halloysite clays have been formed from both hydrothermal alteration and sub-tropical weathering.

The clays are mined by open-pit methods and processed by crushing and fractionation to a product of 98% finer than 2 μm particle size, which is of exceptional whiteness and brightness. The unique properties of these halloysites has led to their world wide utilisation in specialised ceramic applications.

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Contents

Clay Minerals Society Special Publication

Kaolin Genesis and Utilization

Haydn H. Murray
Haydn H. Murray
Dept. of Geological Sciences Indiana University Bloomington, IN 47405
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Wayne M. Bundy
Wayne M. Bundy
3026 Chase Lane Bloomington, IN 47401
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Colin C. Harvey
Colin C. Harvey
Dept. of Geological Sciences Indiana University Bloomington, IN 47405
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Clay Minerals Society
Volume
1
ISBN electronic:
9781881208389
Publication date:
January 01, 1993

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