
438 
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 Odlite, 115 
Lydian-stone, 67, 84 
MAARS, 420 
Macroscopic or megascopic characters, I 
Magma-basalt, 52 
Magma of igneous rocks, 33, 35 
Magmatic-extraction 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 
INDEX 
Mendip Hills, carboniferous 
stone of, I15 
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 
in, 4, 37; in igneous rocks, 36; 
primary or original, 37, 38 ; second- 
ary, 37, 39; 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 
lime- 
NAKKEBROD, 122 
Napoleonite, 124 
Native metals in igneous rocks, 229 
Natrolite, 26 

