Decomposition of Iron Pyrites. 



Density of Pyrite. 

 (continued.) 



379 



Locality. 



Analyst. 



Sp. Gr. 



Kind of Material. 



Brosso, Piedmont. 



Kenngott and V. v. 

 Zepharovich. 



4.807 i 

 5.015 



V similar crystal. 







5.000 i 



V crystal with surfaces some- 

 what attacked and corroded. 





- 



4.779 

 4.800 

 5.053 

 3.769 

 4.891 

 3.930 



Crystals with brown exte- 

 rior, by partial alteration 







Compostella. 



" 31 , 



V to limonite, with more or 







less yellow iron-ochre and 







unaltered pyrite within. 





r 



4.925 

 4.920 







1 



4.930 



Crystals having little lus~ 



Toscana . 



31 { '4.92 



y tre, but with impurities 







4.916 



indistinguishable. 







i 4.878 









4.853 





Compostella. 



C. Ramnielsberg. 3 2 ( 4.750 ( 



Jrystal weighed unbroken, 









but with a cavity within 







1 which contained yellowish 







ochre. 





r 



1 4.815 

 5.013 

 5.015 

 4.854 



4.802 

 4.850 

 4.831 

 4.745 



■ 



Nauiur. Belgium. 



Kenngott and V. 

 v. Zepharovich, 3 3 ] 



4.798 



Crystals with smooth fa- 

 ces, shining or with little 





4.792 







4.791 



lustre. 





1 



4.809 









4.769 









4.844 









4.833 









4.833 







• 



4.908 



. 



31 Kenngott's Min. Notiz. (1855), No. 11. 



32 Zeitschr. d. geol. Ges. (1864), XVI, 267. 



33 Kenngott's Min. Notiz. (1855), No. 11. 



