

T MM E OF BPECIPIC GRAVI1 I!> 



N A \I K 



r; limit'- 



" Furnace product. 



Hercynite 



( Ihrysoberyl 



. 



it 



ii 



" Alexandrite. 



ii 



1 







it 

 it 



Seta 



Zinc iron oxide 



ii 



Zinc chromium oxide 

 Manganese chromiui 



ill--. 



tnije 



u 







Ohrompicotite 



FORMULA. 



Zn Al, o, 



Gl Al ", 



Si-. ( I b 



i 62 





artif. 







I 









Mg Fe 



15 -. 



1 







Zn Mil., <> 4 



Zn I"."', 4 



Zn Cr, 0« 



Mm Cr.n, 





Mi 2 Mn 



1.611 



. 



L87 



A i ra 



and K 



ner. Z. K. M. 7, 



Zippe. Dana's Min. 



Ebcli 



M ■ 



- 



1 1, 



-I and P( " 



l . 

 ; rc li . Geol. 

 Mag. 2 2 



P M. 1 



i 



M 

 17. 



, 



I 

 17. 



.i :. 18. 



4.821 



L498 | 

 1.75, 16° 



1.115 



in. 



IX. [NORGANIC SULPHIDES. 



1st. Simple Sulphides 





1 1 Irogen monosulphide 



II • -! persulpb 



mi Bulpbide 

 P • . — iiiita sulphide 



I IRMVLA. 



II 8 



Sp. Gravity. 







; ,- . G H- 



197 

 .91, l- P R S 



II - . 1.7842 



2. 171 Filhol \- ■ 



B 



