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Mineralogical Magazine; October 1997; v. 61; no. 5; p. 693-698
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Al-rich warwickite from Inglefield Land, North-West Greenland

Peter W. Uitterdijk Appel

Geological Survey of Denmark and Greenland, Copenhagen, Denmark

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+ or -tourmaline. Post-metamorphic alteration of warwickite produced a network of boron-rich minerals and magnetite. The warwickite, containing up to 9.72% Al 2 O 3 , 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.

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