1246 



INDEX. 



Page. 

 Alteration of minerals, chemical reactions and vol- 

 ume changes involved in, table show- 

 ing 375-394 



classification of, with volume changes 395-408 



general nature of.. 202-206 



products of, tables showing 372-374 



with addition or subtraction of material, cate- 

 gories and examples of._ 203-206 



with change in chemical composition, character 



and conditions of 202-206 



without addition or subtraction of material, 



categories and examples of 203 



without change in chemical composition, char- 

 acter and conditions of 202 



Alterations of rocks, general nature of 31-38 



geological factors affecting _ 40-44 



See also Metamorphism. 



Aluminates, deposition of. 541 



Aluminum, in earth's crust, amount and percent- 

 age of 934,936,937,938,983-986 



in rocks of different kinds, proportions of 984 



minerals containing 628 



decomposition of, in rock weathering, order 



of. 



536 



Aluminum ores, formation of 541, 1037 



Aluminum-silicate group of minerals, character, 

 occurrence, formation, and altera- 

 tions of 316-319 



Amesite, alterations and alteration products of.. 347-348 



chemical and physical constants of 196,345 



occurrence of — 346-347 



source and mode of formation of 302, 



304, 328, 369, 390, 393, 399, 403 

 Ammonia, production of, from urea, formula for 



reaction 465 



Amorphous compounds, crystallization and conden- 

 sation of-_ 103 



Amphiboles, alterations and alteration products of .282, 354 



chemical and physical constants of 195, 197, 281 



formation of, from limestones 822 



from pyroxenes 276-278 



occurrence of 281-282 



percentage of, in igneous rocks 937 



sources and mode of formation of. 274, 



276-278, 354, 380, 3S3, 394, 822 

 See also names of minerals of the group, Actino- 

 lite, etc. 

 Amphibole gabbro, mineral composition of, and 



volume changes possible in 632-633 



Analcite, alterations and alteration products of . . 333-335, 

 366,372,376,401 



chemical and physical constants of 195, 330 



occurrence of 331-333 



sources and mode of formation of 260,266, 



267, 292, 293, 295, 296, 334, 335, 366, 369, 

 375, 3S6, 388,392, 397,398, 400, 402, 404 

 Analcite and quartz, alterations and alteration 



products of 375,407 



production of, from albite, volume change inci- 



dentto 632-633 



Anamorphism, propriety of use of term 169 



zone of , chemical changes and reactions in 93-94, 



168, 171, 180, 181, 186, 590, 675-707, 764-766 



chemical reactions in, heat effects of 110-111 



common to zone of katamorphismand. 181-182 

 opposed to those taking place in zone of 



katamorphism 181, 366-369 



thermal and volume conditions and ef- 

 fects of 167,170,186 



Page. 

 Anamorphism, zone of, circulation of gaseous solu- 

 tions in -. 102O-1021 



zone of, condensation of volume of rocks in 169 



conditions and materials in 668-670 



definition of.. 43,167,170,657-659 



deformation in.. _ _ 1011-1012 



energy required for _ 769-774 



dehydration in 178-179,180 



deoxidation in 169,955 



factors dominant in __ 167 



gaseous solutions in, circulation of 1020-1021 



gradation between, and zone of katamor- 

 phism ___ ._ 191 



igneous work in _. _ _ 707-748 



materials and conditions in _ 66S-670 



mechanical work in _ 670-675 



minerals formed in 169,363-364 



oxidation and deoxidation in, thermal and 



volume changes involved in 172 



relation of, to zones of fracture and flow- 

 age 187,190 



to zone of katamorphism 170-1S6, 766-768 



rock flowage in 748-764 



rocks formed in, character of 169 



silication in __ 176-177 



specific gravities of minerals in 169,363-364,924 



temperature conditions in 168, 170 



thermal effects of chemical reactions in 170 



volume changes in 167,182-183 



water in, circulation of 128,129,661-668 



condition of 659-661 



quantityof.. 661 



work in, chemical.. _ 675-706 



igneous _ 707-748 



mechanical 670-675 



Anatase, alterations and alteration products of 230- 



231, 374, 388 



chemical and physical constants of 199,230 



occurrence of 230 



sources and modes of formation of 227, 



228, 230-231, 355, 371, 385, 386, 393, 396, 405 

 Andalusite, alterations and alteration products 



of 317-319,372,399,402 



chemical and physical constants of 195, 316 



occurrence and mineral associates of. 316 



Andesine, mineral composition and physical con- 

 stants of 259 



occurrence, alterations, and alteration products 



of 259-260 



Anglesite, reaction of, on calcium carbonate, equa- 

 tion showing 1147 



Anhydrite, alterations and alteration products of.. 357, 



372,402 



chemical and physical constants of 195, 357, 788 



source and mode of formation of 357, 



358,369,384,400,788-789 

 Anthophyllite, source and mode of formation of . . . 310 



Anhydrous minerals, order of decomposition of 533 



Animals, abundance of, favorable to decomposition 



of rocks 503-504,505-506 



phosphates and nitrates produced by 542-543 



scarcity of, favorable to rock disintegration 



without decomposition 500 



work of , in soils 447-431,45^457,504-506 



Ankerite, alterations and alteration products of. 242-243, 



372, 405, 406 



chemical and physical constants of 195,237 



formation of actinolite from, chemical reaction 



involved in 837 



