None
dolerite of PAGE 375, 376 ... 18 St. ... 222 192 felsites of St. David's 335 granite of St. David's 818 picrite 81, 94 porphyrite 285 Geyser-water, composition of ... 411 Gieseckite-porphyry 360 Glass, characters of 12 - devitrification of 13, 293, 342, 347 Glass-inclusions 19 Glassy base, composition of 42 Globospherites 308 Globulites 14, 194 Glomero-porphyritic structure 186, 230 Gneiss 295 Gneissose granite 325, 831 Granites, British 310 — classification of 290 dynamic metamorphosis of 317 — effect on dolerite and dia- base 236 —passage into gneiss and schist ' ... 325 -veins 236 Granitic texture 57 Granitite 291 Granophyre 292,319,323,342 Granospherites 308 Granular texture 53,55 Granulitic texture 58 Granulation of felspar 175 Granulite 281,295 Greenstone 136,215,221,228 Greisen 294, 315 Ground-mass, of acid rocks 806 - varieties of 59 GUMBEL, epidiorite 135 — keratophyre 369 — lamprophyre 355 — leucophyre 135 — — leucoxene 167 — palseopicrite 80 — peridotites 79 — proterobase 135 GUTHRIE, cryohydrates and eutectic compounds ... 393, 395 GYLLING, sagenite 167 H HAGUE AND IDDINGS, development of crystallization in igneous rocks 23 glassy base of andesites ... 43 nevadite 75 468 Balleflinta 296 HALL JAMES, synthesis of rocks. 403 HARDMAN, analysis by 348 - Hullite 246 HARKNESS AND NICHOLSON, contact metamorphism 390 HARTLEY, movement of bubbles in cavities 24 HATCH, gabbro 161 HAUGHTON, Aberdeen granite ... 324 - analyses by ... 302, 304, 329, 330, 339, 349 — anortbite and labrado- rite. ... 146 — augite 156 — determination of quanti- tative relations of minerals in rocks ... 40 — eucrite 134 — Irish felsites 349 — Irish granites 328 Haughtonite 303 HAUSMANN, diabase 134 • hyalomelane 137 • zircon-syenite 358 HAUY, euphotide 132 — diorite 133 — dolerite 136 Hauyn 364 HAWES, Albany granite 55,379 — analyses by 880 — felspars of dolerite 147 HEDDLE, Aberdeen granite 324 analyses by 803 basalt-glass 185 bytownite and labradorite 146 Canisp porphyry 289 - diopside 89 diopside, augite, diallage 156 gabbro 178 Haughtonite 302 olivine 164 pseudophite 107 rocks of Banffshire ... 251 - sceyelite 101 - serpentine 127 HENRY, analysis of Rowley Eag ... 213 HICKS, rocks of St. David's 222, 318, 335 secondary inclusions ... 27 HILL, E., density of meteorites ... 50 HOCHSTETTER, peridotites 79 HOPFNER AND BscKE, zonal struc- ture in felspar 82 Hornblende, of basic rocks 165 — of serpentines 119 of the gabbros 161 - of the intermediate rocks 260 — of the mica-traps ... 353 — of the nepheline and leucite rocks ... 865 Hornblende of the picrites ophitic PAGE ... 90 ... 251 ... 287 ... 99 232, 245 ... 250 ...81, 97, 99, 100 ... 239 244, 245 ... 215 382 Hornblende-andesite Hornblende-diabase Hornblende-dolerite Hornblende-gabbro Hornblende-picrite Hornblende-rocks, foliated Hornblende-schist Hornblendic greenstones HORNE, andalusite-schist Hornfels 374 HOUGHTON, analyses by 354,389 Hour-glass structure 33, 159 HUDDLESTON, diallage 157 saussurite 153 Hudsonite 82 HUGHES, J., analyses by 228, 283, 328, 339, 343 HULL, basalt 187 Irish granites 831 • mica-traps 357 trap rocks of Limerick. 246 Hullite 246 HUSSAK, secondary augite 260 - serpentine 112 Hyalomelane 137 Hyalosiderite 164 Hypersthene-andesite 43 Hypersthene, inclusions in 29 Hypersthenite 138 IDDINGS AND CROSS, allanite 87 IDDINGS, lithophysse 338 Idiomorphic, definition of 236 Idocrase 890 Igneous rocks, chemical composi- tion of 37 classification of 62 - origin of 11,391 mineralogical composi- tion of 41 - physical characters of 47 - parallel structure in ... 61 — metamorphosis and destruction of 410 — decomposition of 46, 892, 413 Ilmenite, of basic rocks 166 sphene after 200 Inclusions in crystals 17 Intergrowths of different minerals 30 Interstitial matter, chemical com- position of 42 in dolerite 170 Iron (metallic) in basalts ... 38, 169 Iron-ores, of the intermediate rocks 262 IRVING, copper-bearing rocks of Lake Superior • 81 464 JOLY, cordierite in Irish granite ... 805 JUDD AND COLE, basalt-glass ... 77, 184 JUDD, dolerite 184 — — enstatite-porphyrite 285 - gabbro 132, 171 - glomero-porphyritic structure 141 - granite of Beinn Nevis ... 325 - granite of Western Isles. 326 - hypersthene in dolerite ... 163 - liquid-inclusions 141 - mica of sceyelite 92 - porphyrite 287 - rhombic pyroxenes 87 - sceyelite 101 - secondary inclusions 28 - sequence of volcanic rocks ... 67 - serpentine 128 - specific gravity 47 ultra-basic rocks 93 JUKES, white trap 204 JULIEN, fissure-inclusions 27 peridotites 80 K KALKOWSKY, liquid-inclusions ... 27 Kaolinization 411, 414 KAYSEK, contact alteration produced by greenstone 218 Keratophyre 369 Kersantite 351 Kersanton 351 KINAHAN, serpentine 129 KING AND EOWNEY, serpentine ... 129 KJEBULF, contact metamorphism. 376 peridotites 79 KLAPROTH, phonolite 360 KLOOS, saussurite 151 KNOP, augite containing titanium 90, 159 KUCH, intergrowths of magnetite and ilmenite 31, 167 Labradorite, analysis of 147 Carlsbad twins of ... 226 Labradorite-augite rock, synthesis of 404 " Labradorite-porphyry " 186 Labradorite-pyroxene-porphyrite. NEEF, intergrowths of magnetite and ilmenite 31,167 Nepheline-syenite 858 Nepheline-augite rock, synthesis of 405 Nepheline ". 363 Nephelinite 360 Nevadite . . 292 PAGE Nickel-iron, in basalt 38 Nodular felsite 888,849 Normal-pyroxenic and normal trachytic magmas of Bunsen 44 Norite 183,173 Nosean ^ 364 NOURY, rocks of Jersey 267, 357 0 Obsidian OEBEKKE, chrome-diopside — lime-olivine ... - palseopicrite . .. secondary augite 293 89 84 80 260 Oligoclase-augite rock, synthesis of 404 Olivine, 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 853 - zones round ... 173, 176, 249 Olivine-basalt 188, 197, 213, 246 synthesis of 404 Olivine-diabase 223 Olivine-dolerite 96, 183, 195, 210, 241, 245 Olivine -hornblende rocks 122 Ophite 135 Ophitic diabase 224,232 dolerite 182,245 — epidiorite 232 — proterobase 237 — structure 58 — structure, artificial produc- tion of 405 Orthoclase of acid rocks ... 296, 830 of dolerites 147 — of the nepheline and leucite rocks 862 Ottfj all-diabase 242 Oxygen-ratio 40 Palaeopicrite 80 Palagonite 137, 231 Pantellarite 369 PEACH and HORNE, volcanic rocks of Shetland 347 Pegmatitic texture 57,212 dolerite 182 Pegmatite 291 Perowskite 866 Peridotites, analyses of 102 466 PETERSEN, Cheviot rocks ... 43,278 PETTEKSEN, peridotites 79 Perlitic felsite 342 structure 60, 185 Petrosilex 291 PFAFF, contents of inclusions ... 25 PHILLIPS, J. A., Aberdeen granite. 324 - analyses by 231, 238, 275 811, 334, 341, 347, 368 - Cornish elvans ... 333 - Cornish rocks ... 313 - Duporth rock. 129 enstatite-diorite ... 273 - fluid-inclusions. 26 — granite of Newry... 331 — greenstones 229 - mica-trap 355 - Peterhead granite 324 - serpentine 124 Shap granite ... 822 - Steamboat Springs 412 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 259 of acid rocks 299 — of mica-traps 852 — of contact-rocks. 884 PLAYER, analyses by ... 321,347,348 Plutcnic rocks, specific gravity ... 49 POHLMANN, mica-diorite and ker- santite 356 Porphyrite 258, 280 Porphycitic texture 52 Porphyroid 294,337 Propylite 255 Proteolite 885 Proterobase 135, 232, 237, 288, 240, 245 Pseudo-amygdaloids 194 Pseudo-spherulites 16, 83 Pseudophite 107 PUMPELLY, lustre-mottling 81 — pseudomorphs after fel- spar 148 Pyrites 169 oxidation of 46 Pyroxene, inclusions in 29 metamorphosis of 160 Pyroxene, of acid rocks 304 — of basic rocks 155 — of intermediate rocks. 261 — of mica-traps 353 — of peridotites 87 — of the contact rocks. 384 Pyroxene-porphyrite 280, 283 Pyroxenite (Dana) 71 - (Doelter) 77 Q Quartz, in andesitic dolerite ... 195 — in acid rocks 300 — in intermediate rocks. 260 — of contact rocks 385 — pseudomorphous after felspar 315, 412 Quartz-diorite 263,267,276 Quartz-felsite 291 Quartz-gabbro 228 Quartz-norite 255 Quartz-porphyry 291 Quartz-trachyte 292 Quartz-wedge, use of 268 QUENSTEDT, serpentine after oli- vine 104 B EAMSAY, greenstones of North Wales 214 — contact-alteration by green- stone 218 RATH, VOM, forellenstein 133 — tonalite 254 BENARD, analysis by 335 - diabase 234 - peridotites 85 RENARD AND POUSSIN, fluid inclu- sions ... ... 26 — porphyroids 337 — quartz-diorite. 270 EEUSCH, Bergen Peninsula 8 — peridotites 80 - saussurite 151 BEYER, igneous magmas 40 Rhombic pyroxene, of the peridotites 87 — of the basic rocks 163 — of the interme- diate rocks... 261 — of the acid rocks 304 - of the Whin Sill 208 Ehomben-porphyry 369,371 467 Rock, definition of 5 Rock-forming agencies 8 Rocks, classification of 9 ROGEKS, decomposition of felspar. 413 ROHRBACH, teschenite 95,359 ROSE, G., granitite 291 serpentine after olivine 104 ROSENBUSCH, basalt 136 contact-rnetamorph- ism 373 — diabase 184 — 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 RUTLEY, devitrification 810 felsitic lavas 386 - fulgurite 18 — rocks of Brent Tor 229 • strain-phenomena in obsi- dian 12 Rhyolite 292 S Sagenite 167 Salite, conversion of, into serpen- tine 106 SANDBERGER, F., buchonite ... .. 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 SAUSSURE, sagenite 167 Saussurite 148 Saxonite 80 Sceyelite... 101 Schillerization 80 SCHILLING, labradorite in diabase... 147 PAGE "Schliere" 40 Schorl-rock 314 SCHULTZE, serpentine 119 SCHUSTER, MAX, optical characters of felspars 142 SCROPE, sequence of volcanic rocks 67 — inetamorphism 422 Segregation veins in metamorphic regions 418 Serpentine 104 analyses of 124 — from amphibolite Ill - from augite 118 - lattice-structure of ... Ill - mesh-structure of ... 109 - net-structure of 114 — of Anglesea 125 — of Scotland 126 — of the Lizard 120 schistose 117 SHARPE, metamorphism 422 SHEERER, norite 183 SHENCK, contact-alteration by dia base 220 Sideromelane 137 Silica-percentage, range of 88 Silicification of igneous rocks ... 412 Sillimanite 383 Skeleton felspars 15 Slaty greenstone 287 Snake-stone 217 Sodalite 364 Solfataric action, effect of on ig- neous rocks 410 SOLLAS, specific gravity 47 SORBY, effect of pressure on solu- bility 394 Mount Sorrel granite ... 321 origin of igneous rocks. 403 structure of crystals ... 17 use of the quartz-wedge. 268 volcanic tuffs 283 Soret's principle 894 Specific gravity 48 Sphene, after iron-ore 230 of intermediate rocks. 262 Spherulites 15,33,309 composition of 898 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 STEENSTRUP, nickel-iron in basalts 88 STELZNER, melilite-basalt 868 STERRY HUNT, saussurite 148 STOCK, analyses by 207 468 STBENG, diallage 155 forellenstein 133 — gabbro 132,161 SULLIVAN, analysis by 304 Syenite 270, 292, Synthesis of rocks 404 SZABO, determination of felspars... 145 garnet and cordierite in tra- chyte 842 T Tachylite 137, 182 TAIT, M. M., analysis by 347 TAWNEY, Anglesea rocks 319 diabase-porphyrite 221 " greenstones " of North Wales 215 — hornblende-picrite 98 hornblende-porphyrite ... 284 olivine- and hornblende- diabase 99 rocks of St. David's, 222, 318, 335 TEALL, analyses by 157, 209, 200, 265 augite 157 Cheviot-andesites 278 felspar-aggregates as por- phyritic elements 141 felspar of Whin Sill ... 147, 209 intergrowths of pyroxenes 31 North-of-England dykes ... 200 — zonal structure in felspars 32 TELLER AND VON JOHN, norite and quartz-norite 255 Tephrite 360 Teschenite 95,191,359 Texture ... 51, 55 Theralite 359 THURACK, zircon 168 TILDEN AND SfiENSTONE on solubility 393 Titaniferous iron ore 235 Toadstone 209 Tonalite 254 Topaz 305, 316 TORNEBOHM, Ottfjall diabase ... 242 zones round olivine ... 165 Tourmaline 169, 305, 385 Tourmaline-hornfels 375 Trachy-dolerite 258 Trachyte 292 Trachytic rocks 331 texture 69 Troctolite 133, 172 TRAILL, metamorphosis of basic igneous rocks 249 TRECHMANN, gabbro 178 Tremolite, of contact rocks 887 PAGE Tridymite 260,801 TRIPPKE, intergrowths of pyroxenes 81 Trowlesworthite 294, 316 TSCHERMAK, classification of rhom- bic pyroxenes 87 genesis of serpentine... 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