PHYSIOGRAPHY. 177 



Earthy Cobalt. 



tered in form. It occurs at Melili, near Syracuse in Sicily, in the form 

 of a bed of inconsiderable thickness, between beds of a secondary lime- 

 stone. 



2. It probably belongs to the species Bitumen, so far as it is a simple 

 mineral. 



EARTHY COBALT. Cobaltic Lusine-Ore. 



Pulverulent, investing ores of iron and of cobalt, and in- 

 termingled with these, and with earthy matters. 



Color black. 



1. Heated upon charcoal, it gives no arsenical odor; and fused with 

 soda, gives no indication of manganese. With borax, it forms a very in- 

 tensely blue glass. 



2. BEUDANT suggests its composition to be, 



Oxygen - - - - 2890 



Cobalt .... 71-10 



3. It is probably derived from the decomposition of the arseniurets of 

 cobalt, being found in small quantity with these ores. ' 



4. Its principal localities are WOrtemberg, Saalfeld, Joachimsthal and 

 the Tyrol. 



5. The botryoidal and the stalactitic Earthy Cobalt, whose sp. gr. = 

 2-24, and which afford moisture when heated, and the smell of arsenic, 

 appear to be mixtures of the above mineral with Brown Iron-Ore, some 

 of the ores of cobalt and of manganese, together with accidental earthy 

 ingredients; of which character appear to be the following minerals: 



From Riechelsdorf. 







Analyzed by KLAPROTH. 



Peroxide of cobalt with oxide of manganese - - 97-0 



Oxide of manganese .---- 80-0 



Oxide of copper 1-0 



Water - 85-0 



Silica 124-0 



Alumina 102-0 



From Saalfeld. 



Analyzed by DOBEREINER. 



Oxide of cobalt and of manganese - - ' - - 76-9 



Water - 231 



