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Al-rich warwickite from lnglefield Land, North-West Greenland

Published online by Cambridge University Press:  05 July 2018

Peter W. Uitterdijk Appel
Peter W. Uitterdijk Appel*
Affiliation:
Geological Survey of Denmark and Greenland, Thoravej 8, DK-2400 Copenhagen NV, Denmark
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Abstract

Warwickite constitutes about 5% of an outcrop of metamorphosed ultramafic rocks of Precambrian age in North-West Greenland. It occurs as slender grains, several millimetres long, and in anhedral grains up to 5 mm in size, together with forsterite, pleonaste, phlogopite, magnetite ± tourmaline. Post-metamorphic alteration of warwickite produced a network of boron-rich minerals and magnetite. The warwickite, containing up to 9.72% Al2O3, displays a significantly different chemical composition from warwickite elsewhere, such as that in recrystallized limestones from the type locality Warwick, New York, and in lamproitic and carbonatite-like rocks at Jumilla, Spain.

Keywords

warwickiteoxyborateInglefield LandGreenlandaluminium
Type
Research Article
Information
Mineralogical Magazine , Volume 61 , Issue 408 , October 1997 , pp. 693 - 698
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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