188 PROCEEDINGS OF THE ACADEMY OF [Part 1 



dotite. In all cases interesting series of contact zones are ex- 

 hibited (figs. 11 to 13). 



Important deposits were worked in Clay County near Elf on 

 Shooting Creek, on Chunk Gal Mountain, and at Buck Creek. At 

 the Buck Creek or Cullakenee mine, the corundum occurred as 

 grayish-white, bluish, or pink crystals with a deep green smaragdite, 

 and a white granular plagioclase, ranging in composition from an- 

 desine to anorthite. Associated with these were grayish columnar 

 masses of zoisite, and lamellar crystals of margarite. Analyses 

 of the plagioclase are given below. 



^_^._.. . ^- ^ ='^:Svil^a__ 



-— / / 



N^S^i Jli''* * ^ ^ ^ ^^;.c::^^3^^V'^-\ ' 



t>'.^- y,. 



Fig. 12. — Ideal cross-section of an interior vein of corundum at the Corundum 

 Hill mine, Macon County, N. C. (Pratt and Lewis); (1 and 11) normal 

 dunite; (2 and 10) somewhat friable and discolored dunite; (3 and 9) fibrous 

 talc; (4 and 8) grayish, somewhat fibrous, enstatite; (5 and 7) green chlor- 

 ites; (6) central corundum-bearing zone consisting of chlorites, corundum, 

 and spinel. An important variation is the development of a zone of corun- 

 dum-bearing plagioclase either in zone (6) or entirely replacing it. 



At this mine two zeolites, wellsite and chabazite, were found in 

 veins in the feldspar. 



One of the most important mines was the Corundum Hill or 

 Cullasaja mine, seven miles northeast of Franklin, Macon County. 

 The veins were of both the border and interior types (figs. 11 and 

 and 12). An analysis of oligoclase from this locality is given be- 

 low. In addition, large masses of black tourmahne containing cor- 

 undum were found, and very rarely margarite, and minute crystals 

 of diaspore. 



At the Cowee Valley, Macon County, small ruby crystals have 

 been found enclosing rhodolite, a garnet of the composition: 

 8Mg3 ALXSiO^) 3 :re3 AL(SiO,) a. 



