N I) EX 
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Acme mine, N.C., corundum at 83 
Ac worth, Ga. , corundum near 80 
Addie,N. C, corundum at 83 
Africa, corundum in .- 93 
Alabama, corundum in.. 79 
Alaska, corundum in - 
Alps, corundum in - 92 
Aluminum, use of corundum in manu- 
facture of 78 79 
American Bar, Mont., sapphires at 17,82 
Amity. N. Y., corundum at.. 82 
Amphibole-schist, corundum in '>\ '■>'■'> 
Amphibolite, corundum in.. '.'A 26 
emery in 23 26 
Anderson County, S.C., corundum in B' 
Andesite, corundum in. . .'."■ | 30 
Bad Creek mine, N. C, corundum at 62 >v.\.s:; 
Bakersville,N.C, corundum at - ; ; 
Bauer, M., cited 13,54 
Beavett mine, Ga.. corundum at 81 
Bohr mine.N. C, corundum at.. s;> > 
Bell Creek mine, Ga., corundum at 80 
Belts bridge, N.C., corundum at 83 
Be'ment, C. S., reference to ._ 39 
Betts Gap, N. C, corundum at 83 
Biotite, corundum in L9 20 
Bird, R., reference to 49 
Blackhorse, Pa., corundum at. 86 
Blake, W. P., cited 36 
Blue, A., cited 31 
Bohemia, corundum in 92 
Brockton mine, N.C., corundum at 61,83 
Buck Creek, N. G, peridotite at, map 
showing 22 
peridotite at, plate showing 10 
Buck Creek mine, N. G, corundum at 5s ;7.»,83 
view of Go 
Buckley, J. H. , reference to 71 
Bull Mountain, Va. , corundum at 35,87 
Burnt Rock mine, N.C., corundum at 61,83 
Byram, N. J., corundum in limestone 
near ;5t> 
Caler Fork, X . C, ruby- bearing gravel at, 
plate showing 40 
rubies near 40-44,83 
California, corundum in 79-80 
Canada, corundum in 88-89 
Caney Fork, N. C, corundum at 21,83 
Carpenters Knob, N.C., corundum at 83 
Carter mine, N. C. , corundum at _ . 15, 83 
Celos Ridge, N. C. , corundum at 83 
Cement wheel, method of manufacture. . 78 
Centralhatchee, Ga. , corundum at 80 
Chaffee County, Colo., corundum in 80 
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Chandlers Hollow, Del., corundum at 80 
Chase, Dereference to 71 
Chemical wheel, method of manufacture. 77 
Chester, Mass., emery at 23-26,67 70,82 
emery deposit at, map showing (58 
Chlorite-schist, corundum in :.'l 
China, corundum in 92,93 
Chunky Gal Mountains, corundum at 34,60,84 
Clay County. X. <'.. amphibolite and 
corundumin '-' 22 
Cleaning corundum, methods of '. t 75 
Colorado, corundum in 80 
Collins mine, N.C., corundum at . 84 
Connecticut, corundum in 80 
Copper River, Alaska, corundum on 88 
Cortland Township, N.Y.,emei'3 in 70-71 
( 'nrunuum. cleaning, methods of 74 75 
distribution of '■<'■ 72 
hardness of l'» 
localities of 79 93 
mining, methods of.. 72 "l 
occurrence of 10,1] 31 
theoret ical composition of 10-11 
uses of 75-79 
varieties of 9 
Corundum Hill, dunite vein at, cross sec 
tion of 14,15 
peridot ite at, map of 56 
peridotite formation at, plate show- 
ing _ :.. "it; 
sapphires at - 46-47 
vein at, plate showing •">•) 
Corundum Hill mine, N. C. big cut at, 
plate showing 58 
corundum at . .V> 57,84 
corundum contact vein at, cross sec- 
tion of 13 
rubies at 39 10 
Cottonwood Creek, Mont., sapphires on 51-52, 
82 
Co wee Valley, N . C. , corundum in 40-44, 84 
ruby crystals from, plate showing... 42 
ruby mine at, plate showing 40 
rubies in - 40-44 
Coweeta, N. C, corundum at 84 
Craig, B. A. C. , reference to 89 
Crittenden, H. , reference to 49 
Cullakeenee mine, N. C, corundum at 58-59 
ruby corundum at 45 
Cullasagee, N. C, corundum millat, views 
of 74 
sapphire at 46 
Cullasagee mine. See Corundum Hill 
mine. 
95 
