


436 INDEX 
Garnet group, 24 
Garnet-hornfels, 79 
Gash-veins, 259 
Geanticline, 140, 397 
Geodes, 42, 125 
Geological maps and sections, 21 
Geological structure, economic aspects 
of, 330, 347; surface-features deter- 
mined by, 393 
Geological surveying, 273 
Geosyncline, 141, 419 
Geyserite, 6 
Giant granite, 42 
Glacial basins, 421 
Glacial rocks, 62, 310 
Glacial soils, 385, 388 
Glaciated lands, frequency of waterfalls 
in, 418 
Glacier lakes, former, 316 
Glacio-aqueous clay, 61 
Glass in lavas, 35 
Glen App, 414 
Gneiss, 77 ; soil derived from, 381 
Gold, 27, 220, 232, 250, 201, 265, 266 
Goroblagodat, contract ore of, 265 
Gossans, 248, 337 
Grain of granite, 152 
Granite, 41, 87; batholiths of, 186; 
joints in, 147 ; rift or grain of, 152; 
secretions in, 126; soil derived from, 
378 ; xenoliths in, 188, 218, 222 
_Granite-gneiss, 42, 77, 227; -porphyry, 
42 
Granitite, 42 
Granitoid structure, 41 
Granophyre, 43 
Granophyric structure, 42, 50 
Granulite, 78, 382 
Graphic granite, 42 
Graphite, 31, 72 
Graphite-gneiss, 77 
Great Odlite, ores of, 232 
Greece, indented coast of, 423 
Greenland, plateau-basalts of, 211 
Greensand, 61; phosphatic nodules of 
Upper, 73; iron ores in Lower, 232 
Greisen, 42 
Greywacké, 61 
Grey-wethers, 378 
Grit, 60 
Groundmass, 35, 36 
Guano, 72 
Gypsum, 29, 66; concretions of, 123 
HADE of faults, 154, 159; of lodes, 237 
Hematite, 6, 67, 259 
Haloids, 27 
Hammers, geological, 275 
Hanging-wall, 237 
Haplite, 42 
Harz Mountains, 401 ; ores of, 266 
Haiiyne, 14; -phonolite, 48 
Heave of faults, 157, 159 
Heavy spar, 29 
Heliotrope, 5 
Hemicrystalline igneous rocks, 35, 84 
Henry Mountains, laccoliths of, 191 
Highlands (Scottish), relict mountains 
of, 407 
Himalayas, 143, 176, 397, 401 
Holocrystalline rocks, 34, 36 
Horizontal or profile sections, 325 
Hornblende, 17 ; -andesite, 49 ; -basalt, 
51; -gabbro, 49; =SmeIseyeeg7 
-granite, 42; -rock, 78; -schist, 78, 
89 
Hornfels, 77, 79, 217 
Hornstone, 5, 67 
Horst mountains, 179, 401 
Hungary, ores of, 251, 265 
Huron, Lake, 419 
Hyalite, 6 
Hydro-chemical metamorphism, 222 
Hydro-hzmatite, 6 
Hydro-mica-schist, 88 
Hypabyssal eruptive rocks, 184 
Hyperthene, 18 ; -andesite, 49; -basalt, 
51; -dolerite, 50 
Hypidiomorphic (subhedral) minerals, 
36 . 
ICELAND, plateau-basalts of, 211 
Idiomorphic (euhedral) minerals, 36 
Igneous rocks, classification of, 40; 
geological structure of, 184, 202; 
general character of, 333; mineral 
ingredients of, 36; mutual relations 
of, 45, 48, 51; ores in, 229; secre- 
tions in, 124.; soils derived from, 378 
I]menite, 6, 229 

