Al-Rich Warwickite from Inglefield Land, North-West Greenland

Peter W. Uitterdijk Appel
Geological Survey of Denmark and Greenland, Thoravej 8, DK-2400 Copenhangen NV, Denmark

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: warwickite • oxyborate • Inglefield Land • Greenland • aluminium

Mineralogical Magazine; October 1997 v. 61; no. 408; p. 693-698; DOI: 10.1180/minmag.1997.061.408.08
© 1997, The Mineralogical Society
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