1256 



INDEX. 



Tage. 

 Dehydration, carbonation, oxidation, and desilica- 



tion, alterations produced by 399 



Dehydration and decarbonation, alterations pro- 

 duced by__ 401 



Delamar mine, Nevada, secondary enrichment in, 

 showing former presence of circulat- 

 ing waters 1178-1179 



Delesse, A., (?) on decrease of density by vitrifica- 

 tion 103 



on nonaction of dry steam on minerals 493 



Demorphism, belt of, name proposed for belt of 



weathering 163 



Density of minerals composing rocks, increase of 



with increase in depth .. 182-185 



Denudation, belts of ores deposited at different 



levels by reason of.. 1139-1140 



influence of, on ground-water level 426 



Deoxidation, alterations produced by — 401 



definition of 204 



in belt of cementation 165 



in belt of weathering.. 163 



in zone of anamorphism 172, 676 



in zone of katamorphism 162 



of iron compounds insoils, examples of 471-472 



Deoxidation and carbonation, alterations produced 



by 396 



Deoxidation, carbonation, and dehydration, altera- 

 tions, produced by 396 



Dephosphation, definition of 206 



Deposition, discussion of . . - - 487 



in belt of cementation, discussion of .. 165-166,612-617 

 Depth from earth's surface, density of minerals as 



determined by 182-185 



effect of, in metamorphism 43-44 



increase of temperature with increase of 578 



limits of, to which rocks have been observed. . . 31 

 Depth of no annual variation in temperature, prob- 

 able coincidence of, with level of 



ground water 590 



Derby, O. A., on hydration of rocks _.. 481 



Desert varnish, reference to _. 547 



Descending waters, depth of effect of 1179-11S1 



ores precipitated from 1193-1199,1234 



Desilication, agents and processes of 475-476,480 



alterations produced by... 401 



definition of 205 



Desilication and carbonation, alterations produced 



by 396 



Desilication and hydration, alterations produced 



by 404 



Desilication, carbonation, and dehydration, altera- 

 tions produced by 396 



Desilication, carbonation, and hydration, altera- 

 tions produced by _ 398-399 



Desilication, carbonation, hydration, and oxidation, 



alterations produced by. ______ 399 



Desilication, carbonation, oxidation, and dehydra- 

 tion, alterations produced by 399 



Desmine. See Stilbite. 



Desulphation, definition of... 205 



Desulphation, dehydration, and carbonation, alter- 

 ations produced by 396 



Desulphation, hydration, and carbonation, altera- 

 tions produced by 399 



Desulphidation, definition of 205 



Detitanation, definition of 205 



Deville, H. St. Claire, "agents mineralisateurs' 1 de- 

 fined by 59 



Page. 



Devitrification of glass, conditions governing 248-249 



heat and volume, relations of 251 



minerals produced by 251 



scale, rate, and zonal place of 247-252 



Diabase, losses in by weathering, analysis showing. 509, 

 510-511,515,522 



Diallage, alterations and alteration products of 274, 



373,381 

 Diaspore, alterations and alteration products of ... 232, 



373,381,400 



chemical and physical constants of 196,231 



occurrence of 232 



sources and mode of formation of.. 223,235-236, 



292, 296, 29S, 299, 312, 318, 337, 343, 353, 370, 379, 

 380, 383, 38S, 390, 392, 397, 398, 400, 401, 402, 624 

 Diaspore and magnesite, alterations and alteration 



products of.. 381,401 



Diaspore and quartz, alterations and alteration 



products of 381,382,407 



Diaspore group of minerals, character, occurrence, 



formation, and alteration of 231-234 



Diaspore, quartz, and calcite, alterations and alter- 

 ation products of 382,407 



Diaspore, quartz, and potassium carbonate, altera- 

 tion products of 382,407 



Dichroite. See Tolite; Cordierite. 



Dickson, C. W., on ore deposits of Sudbury, Canada. 1047 



Diffusion, influence of, in cementation of rocks .. 636-639 



Diffusion by solution, discussion of. 82-83 



rates of, table showing _ _ 83 



Diller, J. S., figure cited from 814 



Dinpside, alteration of, to talc, quartz, magnetite, 

 and calcite, volume change incident 



to ._ 633 



alterations and alteration products of 273, 



274-275, 277, 278, 373, 382, 398, 408 



chemical and physical constants of 196, 271 



formation of, from dolomite, chemical reaction 



involved in 822 



occurrence of . 272 



source and mode of formation of . . 241, 272, 370, 382, 407 

 Diopside and magnesite, alterations and alteration 



products of 382,408 



Diopside-augite series of minerals, character, oc- 

 currence, formation, and alterations 



of. 272-280 



Diorite, losses in, by weathering, analyses showing. 510, 



515,522 



Dip, steepness of, effect of, on width of fissures 1201 



Disintegration of rocks, regions favorable to 496-501 



relations of decomposition and solution to 494-507 



temperature changes producing, examples of. 4:34-439 



Dissociation, theory of 84-85 



Dissociation of salts in water, phenomena of 73 



Dissolved materials resulting from weathering, dis- 

 tribution of 536-554 



Disthene, alterations and alteration products of.. 318-319 



chemical and physical constants of. 196,316 



See also Cyanite. 

 District of Columbia, granite from, losses of con- 

 stituents in, by weathering 507, 522 



Dittmar, William, on calcium in the ocean, amount 



of 991 



on carbon in atmosphere, amount of _ 964 



on carbon dioxide in the ocean and the air, 



amount of ._ - 967 



on chlorine in the sea, amount of 979 



on ocean, chemical composition of _ 944 



