1286 



IXDEX. 



Zeblites, sources and modes of formation of 260, 



261-263, 265, 292, 294, 295, 298, 353, 625 



Zinc, silicate of, formation of._ 480 



Zinc and lead regions of Mississippi Valley, caves 



in — 565 



depositions in, conditions of 1083,1084 



ground- water level in, effect of changes of 429 



Zinc blende, secondary, figure showing 1156 



Zinc carbonate and sodium carbonate, reaction of, 



on iron sulphide, equation showing.. 1143 

 Zinc, lead, and iron compounds, association of. . 1144-1158 



Zinc ores, associated minerals of _ _ 1144-1145 



Zinc salts, reactions involving 1151-1152 



Zinc sulphate, reaction of, on amorphous silica, 



equation showing 1147 



reaction of, on calcium carbonate, equation 



showing __ 1147 



Zinc sulphide, precipitation of, conditions govern- 

 ing ---- --- 1154-1158 



- reactions involving 1150 



Zincite, occurrences of 1125 



production of. from smithsonite, equation show- 

 ing-- - 1126 



Zircon, alteration and alteration product, of 315 



374,394,402 



chemical and physical constants of 201,315 



hydrous, formation of _ _ '315 



sources of _ 394,402 



occurrence of »,. 



See also Malaeon. 

 Zirkel, Ferdinand, and Naumann, C. F., on forma- - 



tionof smaragdite. _. 374 



Zoisite, alterations and alteration products of... 322-323, 



374,394,399 



chemical and physical constants of.. 201, 320 



occurrence of.... _ _ 32 o,'625 



sources and modes of formation of 223, 225, 



232, 236, 263, 264, 265, 302, 303^ 32o| 

 322, 353, 372, 375, 377, 381, 382, 383, 

 384, 389, 398, 402, 404, 407, 408, 625 

 Zonal arrangement of minerals consequent upon 



igneous intrusion.. 717-720 



Zone. See Anamorphism; Flowage; Fracture; Kata- 



morphism. 

 Zones and belts of metamorphism, deBnitions of... 159, 

 160,163,164,167,189-190 



O 



