INDEX. 



171 



Copper, red or ruby, 47 



black oxide of, 47 



malachite, 48 



silicate of, 48 

 Copperas, 65 

 Cornwall, copper lode s of, 48 



tin ore of, 81 



arsenical pyrites in, 63 

 Corundum, hardness of, 36 



characteristics of, 40, 95 

 Crocidolite, 97 

 Cretaceous rocks, 16 

 Crosscuts, 5 



Crucible, fusion in a, in 

 Cryolite, 41 



Crystallization, systems of, 36 

 Cube, form of a, 36 

 Cupelling, 117 



Cupels, to prepare bone ash, 119 

 Cyanide process, 129 



)AKOTA, gold in, 61 



Denudation of strata, 18 

 Deposit with a curvilinear course, 



Deposits, regular, irregular, and 



superficial, 20 

 Desulphurizing agents, in 

 Devonian rocks, 17 

 Diamonds, occurrence of, 89 



hardness of, 36 



characteristics of, 95 

 Dichroiscope, 93 

 Diorite, 13, 100 

 Dip, definition of, 20 



measurement of, 22 

 Dodecahedron, rhombic, 36 

 Dolerite, 13 

 Dolomite, 14, 101 

 Drift, 4 



EFFERVESCENCE of carbon- 



ates in acid, 31 

 Elvan, 13 



Emerald, 89 



oriental, 92,95 

 characteristics of, 96 



Emery, 40 



Eocene rocks, 16 



FAULTS, 6 



Felspar, 99, 102 



as a standard of hardness, 



36 



Felstone, 13 

 Film over fine gold, 9 

 Firestone, 97 

 Fissure veins, 20 

 Flames, blowpipe, 25 

 Flint, 13 

 Float gold, 52 



rock, 7 



Flouring of mercury, 9, 53 

 Fluor spar, 88 



as a matrix, 7, 105 



nature of, 105 



as a standard of hardness, 36 

 Fluxes, in 

 Footwall, 8 

 Franklinite, 65 



QABBRO, 130 



Galena, simple method ol 

 obtaining lead from, 69 



dry assay for, 119 



ore, 67 



Garnet, characteristics of the, 96 

 Gash vein, 20 

 Gault, 16 

 Glance, zinc, 83 

 Gneiss, 13, 100 



age of crystalline, 1 7 

 Gold ores, treatment of, 128, 129 



tests for, 27, 29, 30, 50 



to dintinguish, 50 



to "pan out," 51 



native, 50 



telluride of, 54, 60 



