Bulletin of the United States Geological Survey--Corundum and Its Occurrence and Distribution in the United States (A Revised and Enlarged Edition of Bulletin ) . are exposed, and little is known of their extent. At Hunters, /./ Fig. 10. Mass of corundum in amphibolite from BuckCreek, Nortli Carolina. 38 CORUNDUM, ITS OCCUREENCE AND DISTRIBUTION. 7 miles west of Statesville, the amphibolite was exposed during explo-ration for corundum, which, according to Lewis,^ was found tooccur in fine brown vermiculite, developed in zones along the bordersof and penetrating the amphibolite, and varyi
Bulletin of the United States Geological Survey--Corundum and Its Occurrence and Distribution in the United States (A Revised and Enlarged Edition of Bulletin ) . are exposed, and little is known of their extent. At Hunters, /./ Fig. 10. Mass of corundum in amphibolite from BuckCreek, Nortli Carolina. 38 CORUNDUM, ITS OCCUREENCE AND DISTRIBUTION. 7 miles west of Statesville, the amphibolite was exposed during explo-ration for corundum, which, according to Lewis,^ was found tooccur in fine brown vermiculite, developed in zones along the bordersof and penetrating the amphibolite, and varying in thickness from afew inches to 3 or tt feet. Fig. 11 is an ideal illustration of the occur-rence of corundum in the amphibolite at Hunters. In this figure, arepresents a feldspar zone that is sometimes encountered in the midstof the vermiculites, h; the feldspar is more or less altered to kaolin,and often bears corundum, although most of it was found in thevermiculite zones, h represents the vermiculite zones carrying thecorundum, which is in crystals and in rounded masses of crystals clus-tered together. Margarite sometimes accompanies it, and large masses. ?2];sn>^
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