PAGE 



ABICH, tracliy-dolerite 258 



Acid rocks, classification of ... 296 



Actinolite, zones round olivine ... 176 



Actinolite-schist 242 



. its relation to 



hornblende-schist 244 



ADAMS, actinolite-schist 244 



zones round olivine 165 



Adinole 217, 219 



Aegirine 365,368 



Agates in porphyrite 281 



Age (geological), as a factor in 



classification 64 



Albite-granite 329 



Albite, analysis of 330 



in saussurite 149 



development of, in rocks 



altered by diabase 221 



Alkalies, in igneous rocks 39 



Allotriomorphic, definition of ... 236 



ALLPORT, Arran pitch stone 344 



contact-metamorphism 



386, 390 



devitrified rocks of Shrop- 



shire 340 



diorite ... 83, 100, 133, 250 



- dolerite ... 136, 187, 210, 229 



effect of granite on dolerite 160 



metamorphic rocks ... 313 

 -phonolite 358,367 



- pitchstone 15, 344 



trap rocks of Limerick . . . 246 



Alumina, conditions of removal 



from igneous rocks of 46 



- range of percentage of 



in igneous rocks 38 



Amblystegite 87 



Analcime 169 



in dolerite 189 



Anamesite 136 



Andesiue, of Scourie Dyke 155 



Andalusite-hornfels 375 



Andalusite in contact rocks 375 



characters of 381 



in granite 306,316 



Andesitic magma, mother-liquor of 43 



dolerite 194, 223 



Andesites, classification of 257 



silicification of 278 



ANDREWS, iron in basalts 38 



Anorthite-augite rock, Artificial 



production of 405 



Anorthite-hornblende rock 252 



Anorthite, analyses of 146 



Anorthosite rocks of Sutherland 174 



Anorthoclase 371 



Anthophyllite, zones round olivine 176 



Antigorite in serpentine 113 



Aplite 291 



Arfvedsonite 365 



Augen-gabbro 178 



Augen-schist 243 



Augite-andesite ... 194, 197, 257, 288 



Augite-biotite-diorite 288 



Augite-diorite 134,228,272 



Augite-minette 355 



Augite-porphyrite 288 



Augite-porphyry 134, 197 



Augite-syenite 293 



Augite, basal striation of 179, 207, 249 



of acid rocks 304 



- of basic igneous rocks ... 157 



of mica-traps 853 



of serpentine 119 



of the nepheline and leucite 



rocks 365 



of the intermediate rocks 261 

 Augitic greenstones of North Wales 21 5 



of Devon and Cornwall ... 228 



Axinite 169 



Axiolite 309 



B 



Banatite 255 



BAEROIS, contact-metamorphism ... 378 



kersanton 351 



BARROW, granite of Ben Vuroch . . . 325 



Basalt 136, 192, 213 



Basalt-glass 184 



" Basaltic " hornblende 95, 96, 165, 231 



Basanite 360 



Basic lavas, Skomer Island 224 



Basic rocks, characters of 131 



- decomposition of ... 205 



- Lake District ... 179,224 



- Midland Counties . . . 209 



- Mid Wales 222 



- North Wales 214 



North of England ... 200 



