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Laccolite ... Lacroix, zeolites Lagorio, analyses by glassy base Lamprophyre Lasaulx, von, contact-metamorphism dolerite eucrite 134, gabbro Irish granites Irish quartz-diorites secondary augite silioification of ande- sites and trachytes Tardree liparite tridymite... Lehmann, contact metamorpbism... secondary twin lamellaa in felspar gabbro igneous origin of quartz ... Lelievre, peridotites Lepidomelane Leucite Leuoite-augite rock, synthesis of... Leucitite Leucitophyre Leucop)hyre 135, Leucotephrite, synthesis of Leucoxene 167, Levy, contact metamorpbism effect of granite on dolerite... structure of granite rocks zonal structure in felspar ... Lherzolite 79, Liebenerite-porphyry LiEBE, proterobasc Limburgite Lime-silicate hornfels Liparite 292, 346, Lithophysffi Longulite LoRETz, porpliyroids LosSEN, classification of rooks contact-alteration produced by diabase effect of granite on diabase keratopbyre kersantite metamorphic rooks proterobase relation between granites and quartz-porphyries . .. the Bode-gang Lustre-mottling 81, Luxullianite 294, Lyell, serpentine PAGE 390 247 248 171 328 266 260 278 347 301 379 152 161 35 79 303 366 405 360 361 225 405 225 379 160 54 32 405 360 135 137 377 347 338 14 338 6 218 160 370 355 35 135 332 55 101 315 128 M Macmahon, Dalliousie rocks 317 Macpheeson, teschenite 95, 369 Magma-basalt 137, 182, 185 465 PAGE Magnetite of basic-rocks 106 Mann, aiigite of nepheline and leucite rocks 365 Margarites 14 Massive rocks, characters of ... 11 Mechanical metamorphism, zone of 242 Melanite 866 Melaphyre 186,209 Melilite 366 Melilite-basalt 868 Merian, tridymite 301 Mesh-structure in serpentine 86, 109 Metamorphism, agents of ... 8, 410 Meteorites, their relation to terres- trial rocks 50 Methekie DE LA, peridotites 79 Miascite 859 Mica of acid rocks 801,880 basic rocks 168 contact rocks 388 mica-traps 852, 857 peridotites 92 the intermediate rocks . . . 261 Mica-diabase 224,852 IMioa-diorite 352 Mica-porphyrite 281,352 Mica-schist 295 Mica-syenite 298 Mica-trap 360 Miorofelsite 807 Microfelsite, spherulites of 402 Micro-flaser structure 233 Micropegmatite ... 30, 57, 180, 327 an eutetic compound 401 composition of 402 Micropegmatite in dolerite 208 Microperthite 31,370 Microcline, characters of 299 Microlites 14 " Mikrolithenfilz " 259 Mineral-inclusions 28 Minerals of igneous rocks 86 Minette 350,857 Minette-felsite 852 Monoclinic pyroxene, of peridotites 88 Mosaic structure 285 Mother-liquor, of andesitic magmas 48 N 217 Nagy, felspar in chlorite-schist _. .. Nbef, intergrowths of magnetite and ilmenite 81,167 Nepheline-syenite 858 Nepheline-augite rock, synthesis of 405 Nepheline 363 Nephelinite 360 Nevadite •• 292 PAOB Nickel-iron, in basalt 38 Nodular felsite 888,849 Normal-pyroxenic and normal trachytiic magmas of Bunsen 44 Norite 133,173 Nosean 864 NouBY, rocks of Jersey 267, 357 0 Obsidian Oebbkke, ohrome-diopside lime-olivine ... — palaBopicrite . .. secondary augite ... 298 ... 89 ... 84 ... 80 ... 260 Oligoclase-augite rock, synthesis of 404 Ohvine, alteration into serpentine 84, 104 inclusions in 30,241 in serpentine 118 nodules 186,246 of peridotites 84 of the basic rocks 164 of mica-traps 353 zones round ... 178,170,249 Olivine-basalt 188,197,218,246 synthesis of 404 Olivine-diabase 223 Olivine-dolerite 96, 188, 195, 210, 241, 245 Olivine-hornblende rocks 122 Ophite .- ... 136 Ophitic diabase 224,232 dolerite 182,245 epidiorite 282 proterobase 237 ■ structure 58 structure, artificial produc- tion of 406 Orthoclase of acid rocks ... 290, 380 • of dolerites 147 of the nepheline and leucite rocks 862 Ottfjilll-diabase 242 Oxygen-ratio 40 Paleeopicrite 80 Palagonite 137,231 Pantellarite 369 Peach and Horne, volcanic rocks of Shetland 347 Pegmatitic texture 57,212 dolerite 182 Pegmatite 291 Perowskite 366 Peridotites, analyses of 102 466 Peteksen, Cheviot rocks Pettersen, peridotites ... Perlitic f el site structure 43, 278 .. 79 .. 342 60, 185 ,. 291 .. 25 .. 324 238, 275 347, 368 383 313 129 273 26 331 229 355 324 124 322 412 Petrosilex Pfaff, contents of inclusions Phillips, J. A., Aberdeen granite analyses by 231 311, 334, 341 Cornish elvans Cornish rooks Duporth rock enstatite-diorite fluid-inclusions granite of Newry greenstones ... mica-trap Peterhead granite serpentine Shap granite — Steamboat Springs Phonolite 360,367 Picotite in serpentine 120 Picrite 80, 81, 82, 94, 97, 124 Pilite 86 Finite 305,334 Pitchstone 293,344 " Pitchstone-porphyrite " 278 Plagioclase, of the nepheline and leucite rocks 363 dynamic metamorpho- sis of 175,233 of peridotites 93 of serpentine 119 of basic igneous rocks 137 of intermediate rocks of acid rocks of mica-traps of contact-rocks Playbb, analyses by ... 321, 347. 259 299 352 384 348 49 Plutc nic rocks , specific gravity . .. PoHLMANN, mica-diorite and ker- santite 356 Porphyrite 258,280 Porphyritic texture 52 Porphyroid 294,337 Propylite 255 Proteolite 385 Proterobase 135, 232, 237, 238, 240, 245 Pseudo-amygdaloids 194 Pseudo-spherulites 16,83 Pseudophite PuMPELLY, lustre-mottling pseudomorphs after fel- spar Pyrites oxidation of Pyroxene, inclusions in metamorphosis of 107 81 148 169 46 29 160 PAGE Pyroxene, of acid rocks 304 of basic rocks 155 of intermediate rocks . . . 261 of mica-traps 358 of peridotites 87 of the contact rocks ... 384 Pyroxene-porphyrite 280, 283 Pyroxenite (Dana) 71 (Doelter) 77 Q Quartz, in andesitic dolerite in acid rocks in intermediate rocks of contact rocks pseudomorphous felspar Quartz-diorite... Quartz-felsite ... Quartz-gabbro Quartz-norite ... Quartz-porphyry Quartz-trachyte Quartz-wedge, use of. QuENSTEDT, Serpentine E . 195 .. 300 .. 260 385 after ... 815,412 . 268, 267, 276 291 228 255 291 292 268 after oli- 104 214 Eamsay, greenstones of North Wales contact-alteration by green- stone 218 Eath, VoM, forellenstein 183 tonalite 254 Eenabd, analysis by 335 diabase 234 peridotites 85 Eenabd and Podssin, fluid inclu- sions ... ... 26 porphyroids 337 quartz-diorite . 270 Eeusch, Bergen Peninsula 8 peridotites 80 saussurite 151 Eeyer, igneous magmas 40 Ehombic pyroxene, of the peridotites 87 of the basic rocks 163 of the interme- diate rocks... 261 of the acid rocks 804 of the Whin Sill 208 Ehomben-porphyry 369,371 467 Rock, definition of 5 Rock-forming agencies g Rocks, classification of 9 RoGEBS, decomposition ot felspar . -413 RoHBBAOH, tesclienite 95,359 Rose, G., granitite 291 serpentine after olivine 104 RosENBuscH, basalt iqq contact-metamorph- ism 373 diabase 134 gabbro 132 granite rocks 15 granular and porphy- ritic textures ... 52 lamprophyre 351 leucophyre 225 ^ limburgite 173 mica-traps 351 ■ micro-felsite 402 rutile 219 spherulites 33 theralite 359 Ross, rocks of St. Kilda 247 Roth, J., origin of serpentine ... 105 Rutile after iron-ore 230 in actinolitic schist 243 in granite 324 in hematite 167 in spilosite and adinole 219 RuTLBY, devitrification 310 felsitic lavas 336 fulgurite 13 rocks of Brent Tor 229 strain-phenomena in obsi- dian Rhyolite ... S 12 292 167 Sagenite Salite, conversion of, into serpen- tine 106 Sandbebgee, F., buchouite 360 genesis of serpen- tine 107 heavy metals in rock-forming minerals 37 ■ peridotites ... 79 proto-lithionite 302 Sandstone, alteration of by granite 378 Sanidine 296 in Tardree liparite ... 348 Saussube, sagenite 167 Saussurite 148 Saxonite 80 Sceyelite 101 Schillerization 30 Schilling, labradorite in diabase... 147 " Schliere " 49 Schorl-rook 314 SoHULTZE, serpentine 119 Sohusteb, Max, optical characters of felspars 142 ScEoPE, sequence of volcanic rocks 67 metamorphism 422 Segregation veins in metamorphic regions 418 Serpentine 104 analyses of 124 from amphibolite Ill from augite 113 lattice-structure of ... Ill mesh-structure of ... 109 net-structure of 114 of Anglesea 125 of Scotland 126 of the Lizard 120 schistose II7 Shabpe, metamorphism 422 Sheeeeb, norite I33 Shenck, contact-alteration by dia base 220 Sideromelane 137 Silica-percentage, range of 38 Sihcification of igneous rooks ... 412 SiUimanite 383 Skeleton felspars 15 Slaty greenstone 237 Snake-stone 217 Sodahte 364 Solfatarie action, effect of on ig- neous rocks 410 SoLLAs, specific gravity 47 SoBBY, effect of pressure on solu- bility 394 Mount Sorrel granite . . . 321 origin of igneous rocks . . . 403 structure of crystals ... 17 use of the quartz-wedgt . . . 268 volcanic tuffs 283 Soret's p/rinoiple 394 Specific gravity 48 Sphene, after iron-ore 280 of intermediate rocks . . . 262 Spherulites 15,33,309 composition of 398 Spherulitic felsite 334,340,347 Spilosite 218 Spinellids, in ultra-basic rocks ... 93 Spotted slate 374 Staurolite 374, 382 Steatite 116 Stead, analyses by 207 Steenstbup, nickel-iron in basalts 38 Stelznbe, melilite-basalt 368 Sterey Hunt, saussurite 148 Stock, analyses by 207 468 Steeng, diallage ■ forellenstein . .. gabbro Sullivan, analysis by ... Syenite Synthesis of rocks SzABO, determination of felspars.. garnet and cordierite in tra cliyte PAGE ... 155 ... 133 182, 161 ... 304 270, 292, ... 404 145 842 Tacbylite 187,182 Tait, M. M., analysis by 847 Tawney, Anglesea rocks 819 diabase-porphyrite 221 " greenstones " of North Wales hornblende-pierite hornblende-porphyrite . .. olivine- and hornblende - diabase rocks of St. David's, 222, 318, Teall, analyses by 157, 209, 200, augite Cheviot-andesites felspar-aggregates as por- phyritic elements felspar of Whin SiU ... 147, intergrowths of pyroxenes North-of-England dykes . .. zonal structure in felspars Teller and Von John, norite and quartz -norite Tephrite Teschenite Texture Theralite Thdback, zircon Tilden and Shenstone on solubility Titaniferous iron ore Toadstone Tonalite Topaz sot ToENEBOHM, Ottfjilll diabasG zones round olivine . .. Tourmaline 169, 305 Tourmaline-hornfels Trachy-dolerite Trachyte Trachytic rocks texture 215 98 284 99 335 265 157 278 141 209 81 200 82 255 860 95, 191, 859 51,55 359 168 398 285 209 254 816 242 165 385 375 258 292 331 69 172 . 138, basic Troctolite Traill, metamorphosis of igneous rocks 249 Trechmann, gabbro 178 Tremolite, of contact rocks 387 PAGE Tridymite 260,801 Trippke, intergrowths of pyroxenes 81 Trowlesworthite 294,816 Tsohermak, classification of rhom- bic pyroxenes 87 genesis of serpentine... 108 peridotites 79 picrite 80 pseudomorphs after oli- vine 86 teschenite 859 U Uralite diabase of Variolite Velain, spheue and iron ores Yesuvianite Vitreous rocks, specific gravity of Vitrophyre Vogelsang, Arran pitchstones crystallites Scotch basalts secondary inclusions . .. skeleton crystals magnetite Vogesite Volcanic rocks, sequence of ... • specific gravity of ... Volger, serpentine after olivine W Wadswoeth, classification of rocks saxonite Waller, analyses by ... 218, 275, contemporaneous veins ... enstatite-diorite felsites of Warwickshire . .. felspar of contemporaneous veins strain-phenomena in obsi- dian Ward, contact-metamorphism diorite felsites of Lake District . .. granites of Lake District ... inclusions minette Or dovician felsites porphyrites of Lake District rocks of Eycott Hill Watts, enstatite-diabase enstatite-porphyrite. 285 148 134 269 390 49 292 844 18 190 27 166 351 67 49 104 Watt Gregory, synthesis of rocks 65 80 344 211 278 341 138 12 889 99 342 822 26 357 836 281 225 222 284 403 4G9 PAGE Websky, serpentine 108 Weigand, serpentine 110 Werveke, foyaite 359 hour-glass structure ... 33 secondary twinning iu felspar 151 Whin Sill 147, 1.H7, 207 White trap 210 WiCHMAN'N, fulgurite 13 WiLLi.\Ms, G. H., enstatite-syenite 293 peridotite Hi gabbro 161 zones round olivine 165 Wilson, analyses by ... 228, 275, 335 Wolff, theralite 360 WoUastonite 384 Worth, contact-metamorphism ... 388 rocks of Plymouth 229 Zeolites, formation of Zn-con 168, Zircon-syenite ZniKEL, Arran pitchstones basalt 136 corsite diabase diorite euorite gabbro granites of Scotland inclusions quartz-diorite Zoisite Zoisite in saussurite Zonal structure of crystals. Zones round olivine PAGE ... 413 268, 304 ... 358 ... 344 193, 195 ... 131 ... 134 ... 133 ... 134 132, 171 ... 326 18, 141 ... 263 ... 228 149, 154 21, 31 165, 176 rrlnl'.r,., 23, Hid r.nihii, Lnnilmi; mi" ( Derhti. 