INDEX 
I'ago. 
Abrasive efficiency of corundum 18-19 
A frica, corundum near Pretoria 15S 
Alabama- 
Corundum in: 
Dudlcyville 131,141 
Hanover 141 
Alaska, corundiim on Copper River 150 
Alluvial deposits, corundum in 61 
Al ps, corundum in 157 
Alteration products of corundum 60-71 
Alumina, separation of, from molten mag- 
mas 91 
Aluminum, corundum as source of 167 
American Prospecting and Mining Com- 
pany, properties of 99 
Ampliibole at Chester, Mass., origin of 
emery in 92-93 
A nipliibole-schist, corundum in 57-59 
corundum in, origin of 95-96 
Ampliibolite at Biick Creek, N. C, charac- 
ter of 36-37 
corundum in 35-40 
.Analyses of corundum 20 
Andesite, corundum in 44-46 
Anorthosite, corundum in 40-41 
Artificial production of corundimi 71-95 
Ashland Emery and Corundum Company, 
mine of 26 
Asia Minor, emery in 61 
emery in, discovery of 11 
Asterism, occurrence and cause of 104 
Australia, sapphires in 153, 157 
Austria, corundum in 158 
Austrian Silesia, corundum in 158 
Basalt, corundum in 64 
Belt formation, occurrence and character 
of 94-95 
Biotite, corundum in 54 
occurrence of 44 
Bird, Robert, sapphire claim owned by 108 
Block corundum, description of 25 
Bohemia, corundum in 40, 157 
Bournon, Count de, on corundum stone and 
varieties 16 
Burma, sapphires in 155 
California- 
corundum in: 
Los Angeles County 141 
Meadow Valley 141 
Phimas County '. 12, 42, 141 
Camerlander, Dr. F. von, on occurrence of 
corundum in amphibolites of 
northwestern Austrian Silesia. . 40 
Page. 
Canada, corundum in 40, 49, 63, 151-153 
conuidum- bearing rocks of Ontario, 
map showing location of 152 
Ceylon, sapphires in 155 
Chandler, W. G., work of 125-126 
Chemical composition of corundum 20-21 
China, conmdum in 157, 158 
Chlorite, corundum in, at Corundum Hill, 
N. C, plate showing 52 
occurrence of 39 
Chlorite-schist, corundum in 59 
Chromite, occurrence of 29, 34, 92 
Cleaning corundum, methods of 160-162 
Colorado- 
corundum in: 
canyon 49, 141 
Chaffee County 55, 141 
Saxon Mountai n 141 
Composition, chemical, oi corundum 20-21 
Connecticut- 
corundum in: 
Barkhamsted 132, 141 
Litchfield 132,141 
Norwich 141 
Contact zones, corundum in inclusions and . 64-65 
Cortlandt series, occurrence of 41 
Corundum and feldspar zones, localities 
of 33 
Corundum-bearing rocks in United States . 27-62 
Corundum schists and porphyroids, occur- 
rence of 65 
Corundum wheels, manufacture, etc., of. 163-167 
Crittenden, Henry, operations of 108 
Crystal corundum, description of 25 
Crystal forms of corundum. 1-5-16, 101-102, 104, 109 
Crystallography of sapphires of Montana. 113-114 
Cyanite, occurrence of 53, 54 
Delaware, corundum in 142 
Dike in open cut, plate showing face of 112 
Diorite, corundum in 62-63 
Distribution of corundum in foreign coun- 
tries 150-158 
of corundum in United States 97-150 
Durrant, John, sapphire claims of 108 
Edman, J. A., discovery of corundum by .. 42 
Eldorado Gold and Gem Company, opera- 
tions of 107-108 
Emerson, B. K., on corundum in metamor- 
phosed zone between harzburg- 
ite and gneiss 53 
on emery at Chester, Mass 38-39 
on "Rowe schist" 39 
on " Savoy schist " 39 
171 
