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Garde, A. and Marker, M. 1988. Corundum crystals with blue-red colour zoning near Kangerdluarssuk, Sukkertoppen district, West Greenland. Rapport Grønlands Geologiske Undersøgelse. 140, (Dec. 1988), 46–49. DOI:https://doi.org/10.34194/rapggu.v140.8032.