Garde A, Marker M. Corundum crystals with blue-red colour zoning near Kangerdluarssuk, Sukkertoppen district, West Greenland. rapggu [Internet]. 1988 Dec. 31 [cited 2024 Jul. 3];140:46-9. Available from: https://geusjournals.org/index.php/rapggu/article/view/8032