INDEX. 
175 
Page. 
I 'yroxenite, corundum in 35 
' .Miiirtz-porphyry, corundum in 64 
< 'iiartz-schist, corundum in 55-56 
corundum in, origin of 96-97 
Urfniction of gems 20, 23 
i locks, corundum bearing, in United States. 27-62 
INicntgen rays, corundum gems distin- 
guished by 19 
i:ul)y, distribution and character of 97-105 
Ku by-bearing gravel at Covvee Valley, 
N. C, plate showing 60 
Kuliy crystals from Cowee Valley, N. C, 
plate showing 102 
Uiissia, corundum in Urals 41, 158 
Sand corundum, description of 25 
SMi>phire crystals from Yolo Gulch, Mont., 
plate showing 114 
Sapphire deposits in Montana, map show- 
ing location of 106 
in Montana, Spokane Bar, figure show- 
ing 108 
Sapphires, description of 22-24 
distribution and character of 97- 
116, 153, 155, 157, 158 
etching figures on 114-115 
names of varieties of 13-14 
Scotland, sapphires in 157 
Serpentine, corundum in 34, 50 
Siam, sapphires in 155 
Smith, C. D., on minerals associated with 
corundum 34 
Smith, J. L., corundum deposits discovered 
by 9 
South Carolina- 
corundum in: 
Anderson County 130, 149 
Energy 149 
GafTney 55, 65, 149 
Laurens County 55, 130, 149-150 
Nannies Mountain 48, 131 
Page. 
South Carolina — Continued, 
corundum in — Continued. 
Oconee County 130, 150 
Spartanburg County 130 
York County 130, 150 
Spain, corundum in : . . . 45 
Specific gravity of corundum 19 
Spinel, occurrence of 34, 35 
Suggestions to prospectors for corundum. 168-169 
Syenite, corundum in 48-49 
Syenite-pegmatite, corundum in 63-64 
Technology of corundum 159-167 
Tonalite, corundum in 63 
Trachyte, corundum in 64 
Traphagen, F. W., acknowledgment to 49 
Turkey, discovery of corundum in 9 
emery in 155-156 
Twinning of corundum 16 
Tyrol, corundum in 158 
Ural Mountains, corundum in 41, 158 
Uses of corundum 162-167 
Utah, corundum in 150 
Varieties of corundum, description of 22-27 
Virginia — 
corundum in: 
Louisa County 131,150 
Stuart 150 
emery in: 
Pittsylvania County 140, 150 
Whittles 150 
Watch jewels, corundum used for 162-163 
Weed, W. H. , on igneous origin of sapphires. 95 
Wheel, cement, manufacture of, method of. 167 
Wheel, chemical, manufacture of, method 
of 167 
Wheel, vitrified, manufacture of, method 
of 165-167 
Williams, G. H., on feldspathicperidotite of 
eastern Maryland 88-89 
X ray • corundum gems distinguished by.. 19 
