Bulletin of the United States Geological Survey--Corundum and Its Occurrence and Distribution in the United States (A Revised and Enlarged Edition of Bulletin ) . ?2];sn>^. Fig. 11.—Ideal vertical cross section of corundum in amphibolite at Hunters, Iredell County, N. C. made up almost entirely of these two minerals have been found onthe surface in this region, c represents radiating borders of actino-lite that inclose large masses of what was once amphibolite, but whatis now nothing but a mass of ocherous clay, bearing occasional needlesof hornl)lende and scales of vermiculite. The o
Bulletin of the United States Geological Survey--Corundum and Its Occurrence and Distribution in the United States (A Revised and Enlarged Edition of Bulletin ) . ?2];sn>^. Fig. 11.—Ideal vertical cross section of corundum in amphibolite at Hunters, Iredell County, N. C. made up almost entirely of these two minerals have been found onthe surface in this region, c represents radiating borders of actino-lite that inclose large masses of what was once amphibolite, but whatis now nothing but a mass of ocherous clay, bearing occasional needlesof hornl)lende and scales of vermiculite. The outer portions, d, aredark-green amphibolite. CORUNDUM (emery) TN AMPHIBOLITE AT CHESTER, MASS. The most widely known occurrence of corundum in amphibolite isthat of the emery at Chester, Mass., an elaborate description of wliichis given by Prof. B. K. Emerson ^ in his exhaustive work on the geol-ogy of old Hampshire County, Mass. « Bull. Oeol. Survey North Carolina No. 11, 1896, p. U. S. Geol. Survey, vol. 29, 1898. CORUNDUM IN IGNEOUS ROCKS. 39 A band of amphibolite that is conformable throughout its entireextent with the sericitic schists of this section of the
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