172 
INDEX. 
Page. 
Emery at Chester, Mass 38-40 
description, source, etc., of 26-27 
distribution and character of . 134-140, 155-157 
in amphibolite at Chester, Mass., origin 
of 92-93 
in undetermined association 61-62 
names of varieties of 14 
Enstatite rocks, occurrence of 35 
Etching figures on sapphires 114-115 
Feldspar and corundum zones, localities of. 33 
Ferguson, Hugh, property of, yellow corun- 
dum found on 121 
Foreign occurrences of corundum . 62-65, 150-158 
Fracture of corundum 18 
France, corundum in 45, 48, 157 
Gabbro, corundum in 63 
Garnet, corundum in 100-101 
Gem corundum, description of 22-24 
distribution of 97-116 
Gems, essential properties of 22 
hardness of| 24 
refraction of 20, 23 
Georgia- 
corundum in: 
Acworth 142 
BeU Creek mine 142 
Caldwell 142 
Centralhatchee 142 
Douglas County 142 
Foster mine 123, 130, 142 
Gainesville 142 
Habersham County 142 
Hamilton mine 142 
Hiawassee 142 
Hog Creek mine 142 
Laurel Creek mine . . 12, 25, 81, 128-129, 142 
Monroe 142-143 
Pine Mountain 12, 143 
Porter Springs 143 
Powder Springs 143 
Rabun Gap 143 
Stone mine 143 
Teltonville 56, 143 
Thomaston 55, 143 
Track Rock mine 37, 59, i 30, 143 
West Point 143 
Foster mine, description of 130 
Laurel Creek, corundum at, interior 
vein of, plate showing 130 
peridotite formation at, plate show- 
ing 130 
peridotite-gneiss contact at, plate 
showing open cut on 128 
Laurel Creek mine, description of 128-129 
peridotite rocks and corundum locali- 
ties in, map showing 126 
ruby in 105 
Trap Rock mine, description of 130 
Germany, corundum in 42, 46, 47, 158 
Gneiss, corundum in 50-53 
corundum in, at Muskrat Fork, N. C, 
plate showing 52 
metamorphosed zone between harz- 
burgite and 53-61 
Granite, corundum in 48 
Grapliite, corundum in 65 
Pagp 
Gravity, specific, of corundum 19 
Grecian Archipelago, corundum in, discov- 
ery of 9 
emery in 26, 156-157 
Hardness of corundum 18 
of gems 24 
Harzburgite, corundum in metamorphosed 
zone between gneiss and 53-61 
Hayes, U. S., corundum property developed 
by 33 
Hidden, W. E., on new twinning plane in 
corundum 16 
Himalayas, sapphires in 157 
Historical sketch of corundum 9-13 
Holland, corundum in 157 
Hornblende-gneiss associated with perido- 
tite, character of 29-30 
Hunt, A. E., on corundum as a source of 
aluminum 167 
Hunt, T. S., on origlh ot some magnesian 
and aluminous rocks 75 
Idaho — 
corundum in: 
Orofino Creek 116,143 
Pierce City 116, 143 
Rhodes Creek 116,143 
Igneous rocks, corundum in 28-50 
corundum in, origin of 76 
Igneous rocks, foreign, corundum in 62-65 
Inclusion and contact-zones, corundum in. 64-65 
India, corundxim in 153-154 
corundum in, development of 9 
International Corundum and Emery Com- 
pany, property of 118, 119, 121 
Italy, corundum in 157 
Johnson, Charles, sapphire claims of 108 
Judd, J. W., on parting in corundum 17 
Knuth, William, acknowledgment to 110 
Kunz, G. F., on corundum in andesite 44 
on utilization of sapphire as watch jew- 
els 163 
Kyschtymite, corundum in 62 
Lacroix, A., on occurrence of corundum in 
Auvergne Mountains, France.. 45 
Lawson, A. C, on occurrence of corundum 
in Plumas County, Cal 42-44 
Limestone, crystalline, corundum in 60-61 
Literature on origin of corundum in peri- 
dotite, review of 76-79 
Localities of corundum in United States, 
map showing 27 
Lyman, C. E., corundum described by 51 
Maine, corundum in 143 
Maryland, corundum in 144 
Massachusetts, amphibolite at Chester, de- 
scription of 39 
Chester, discovery and mining of emery 
at 11,26 
corundum at 144 
Pelham 11, 35, 53, 86, 132 
Sackett mine 40 
emery at: 
Chester 11, 26, 38-40, 92-93, 134-137, 144 
Huntington 137, 144 
Metamorphic rocks, corundum in 50-53 
corundum in, origin of 95-97 
