COLLIX'TIONS IN ECONUMIC GEOLOGY AND MKlALLLKCiV. 173 



Nickel. 



(1) Miitto, obtained by Hmoltiiip; the oreHof tho ({aj* Mine. (HKiOO.) 



(2) Cast, iiiioilfs fur nickel plating, tivr (lill'iin«nt Htyle.s. (:U)'j;{r,.) 



(3) Cast, anoilo for iiicki-l platin;j that has been in nse. (•i'JU"^!.) 

 ^4) Cast, in lotls, three Hizcs. ('M>'Xi7.) 



(:'>) Cast, turntMl down to a snnili rod. (1U171.) 

 (0) Cast, in cnhes, for niakinj; anodes. (IJOKJK.^ 

 (7) Cast, in ;;rains, for making anodes. (:{0'J48.) 

 (S) Wron^hl, sipiare bar, haniiuered. (;J0938.) 

 (1>) Wronjjht, rolled into sheets. (.')118-2.) 



(10) WroMjiht, rolled rod. (-291)78.) 



(11) Platin-;, three saini)les. ('iOO'i'i.) 



(12) Plating, wrought iron with 10 per eent. of iiiekel on eacli side, rolled down. 



(:«:uo.) 



Sails of Xickel. 



(1) Oxide. (:]0'J52.) (:i) Nitrate. (30002.) 



(2) Chloride. (30%3.) (4) .Sulphate. (30>>r)3.) 

 (.")) .Sulphate of nickel and anunonia, for jilatinj; j)iirpo.ses. (30"J.">4.4 

 (6) Sulphate of nickel and aminouia. crystallized in a dome. (309.')5. ) 



Coholl. 



(1) Cast, anodes for plating, four sizes. (liUDTJ. ) 



(2) Plating. (211923.) 



(3) Plating. (29G79.) 



(4) nine ghass, colore<l by oxide of cobalt. (30940.) 



(5) Blue glass, coloreil l>y oxide of colialt; made into gallipots. (30911.) 



(6) Blue gla8.s, colored bj' oxide of cobalt ; made into bottles. (3ri'.il.'i. > 



Salts of Cobalt. 



(1) Oxide. (30957.) 



(2) Chloride. (309ri8.) 



(3) Nitrate. (30<j.-)9.) 



(4) Sulphate of cobalt and ammonia, for plating. (309ti0.) 



(5) Sul\diate of cobalt and ammonia, crystallized in a dome. (30901.) 



(1) Sulphate of copper. Formed as a by-product in treating the ores of the Gai> 

 Mine. (30950.) 



ZINC. 



Zinc Minerals. 



zincite. (rki) zinc! ore.) 



Composition: /tiO. Oxide of zinc, cnntiiiiiin^- /.iiic So.i'tl pci cnii. 

 and oxy;.:«'n li).74 percent. 



Itciy.stiillize.sin tlieIn'x;«<;onai .system, hiitcfsstalsare very rare, jjener 

 ally occurs foliate<l,ainl varying,' in si/e from small .i,'rains to larjre nnis.ses. 

 It varies in liardness from 4 to 4.5 and in sp»>cilic jL^ravity from ~kI'\ to 

 5.7. It has an adamantine luster, is tlark red in color, and translilcent. 



