Cadmium, and Mercury. 



347 



Table III. 

 Influence of iron on the inversion temperature of sphalerite. 







I 



II 



III 



IV 



V 



Locality 



Sonora, 

 Mex. 



Scotland 



Guipuzcoa, 

 Spain 



Queensland, 

 Australia 



Breitenbrunn , 

 Saxony 



<v 



"-5 



S 



Quartz 



Pyrite 



Copper 



„ Manganese 







0-33$ 

 0-13 



0-22 

 tr 



0-20 



3-0 fo 



o-io 



1-05 



Percentage of 

 iron 



Inversion tem- 

 perature 



0-15 

 1020° 



1-43 

 998° 



5-47 

 955° 



10-8 

 919° 



17-06 



880° 



Oporto, Portugal, containing 7-43 per cent iron, 0-68 per cent 

 cadmium and traces of lead and silver, was tested repeatedly 

 and found to have an inversion temperature of 1035° as com- 

 pared to 1020° for pure sphalerite. 



The specific gravities of these blendes were also determined 

 and from them the specific volumes were calculated. 



Table IV. 

 Influence of ferrous sulphide on the specific gravity of sphalerite. 





I 



II 



III 



IV 



V 



Locality 



Sonora, 

 Mex. 



Scotland 



Guipuzcoa, 

 Spain 



Queensland, 

 Australia 



Breiten- 

 brunn, 

 Saxony 



Percentage of iron . . 

 Sp. gr. at 25° 



Sp. gr. corrected .... 



t-x mineral at 25° 



Density ; — 77; 



water at 4 



Specific volume 



0-15$ 

 4-102 



4-090 

 0-2444 



1-43$ 

 2-091 



4-079 

 0-2451 



5-47$ 

 4-035 

 4-042* 



4-030 



0-2481 



10-8$ 

 3-99f 



__ 



3-98 

 0-2513 



17-06 

 3-970 

 3-946J 



3-935 



0-2541 



* Corrected for 0'33 per cent quartz, sp. gr. 2 - 65 (see Table III). 



f Only 3 - 5 grms. were available for this determination ; hence the gravity 

 is given only to the second decimal. 



\ Corrected for 3 per cent pyrite, sp. gr. 5 - 02 (see Table III), from which it 

 was separated by dissolving in hydrochloric acid in a carbon dioxide 

 atmosphere. 



