438 



INDEX 



Loam, 63, 380, 381, 384, 385, 388, 390, 



391. 392 



Loch Ness, 326 



Lodes, 237 ; association of ores in, 249 ; 

 branching and intersecting, 242 ; 

 coincident and transverse, 240 ; con- 

 tents of, 244 ; depth of, 239 ; hade or 

 underlie of, 237 ; heaving of, 244 ; 

 outcrop of, 247 ; simple and complex, 

 240 ; structure of, 245 ; succession of 

 minerals in, 249 ; systems of, 241 ; 

 walls of, 251 ; width and extent of, 

 238 



Loess, 59, 396 ; concretions in, 122 



London-clay, fossils of, 99 



Longitudinal faults, 162 



Lower Greensand, ores of, 232 



Lower Oolite, 115 



Lydian-stone, 67, 84 



MAARS, 420 



Macroscopic or megascopic characters, I 



Magma-basalt, 52 



Magma of igneous rocks, 33, 35 



Magmatic-extr action and magmatic- 



segregation ore-formations, 267 

 Magnetic iron-ore, 68 

 Magnetic Pyrite. See Pyrrhotite 

 Magnetite, 7, 229 

 Magnesian limestone, 65 

 Malachite, 261 

 Malaysian tin-fields, 234 

 Manganese concretions, 123 ; ores, 231, 



236, 256, 261 

 Mansfeld copper-slate, 263 

 Maps, 277, 278 

 Marble, 78, 382 

 Marcasite, 28, 122 

 Marl, 70, 384 

 Marlekor, 122 



Masses (ore-formations), 258 

 Massive lodes, 245 

 Master-joints, 145 

 Matrix in lodes, 244 

 Measurement of thickness of strata, 



292 

 Mechanically-formed rocks, 56 

 Meerschaum, 23 

 Meinkjar, Norway, 230 

 Melanite, 24 



Mendip Hills, carboniferous lime- 

 stone of, 115 



Menilite, 6, 121 



Mesozoic iron-ores, 232 



Metals or rock-constituents, 266 



Metamorphic rocks, 74 ; soils derived 

 from, 381 



Metamorphism, 213, 214, 220, 300, 303 



Metasomatic replacement, 259 



Mexico, gold and silver lodes of, 265 



Mica, 20; -basalt, 51; -diorite, 48; 

 dolerite, 50 ; -norite, 49 ; -schist, 77, 

 381 ; -syenite, 46 ; -trap, 46, 48 



Michigan, Lake, 419 



Microcline, 11 



Microfelsitic matter, 35, 36 



Microgranite, 42 



Microlites, 34 



Micropegmatitic structure, 42, 43, 50 



Minerals, rock-forming, 2 ; inclusions 

 i n > 4» 37 5 in igneous rocks, 36 ; 

 primary or original, 37, 38 ; second- 

 ly) 37i 39 5 replacing organic struc- 

 tures, 92 ; hardness of, 427 



Minette, 46 



Mississippi, plains of the, 412 



Moh's scale of hardness, 427 



Molecular replacement, 92 



Molybdenite, 249 



Monoclinal flexures and faults, 173 



Monoclines, 134 



Monogenetic mountains, 401 



Monte Nuovo, 196 



Moraines, 64, 314, 396 



Morion, 5 



Moss-agate, 5 



" Mother Lode," Sierra Nevada, 238, 

 266 



Mottram St Andrews, ore at, 261 



Moulds and casts (fossils), 91 



Mountain-cork, 17 ; -leather, 17 



Mountains, original or tectonic, 394 ; 

 subsequent or relict, 400 



Muscovite, 21 ; -granite, 42 



Mylonites, 81 



NAkkebrod, 122 



Napoleonite, 1 24 



Native metals in igneous rocks, 229 



Natrolite, 26 



