134 



PHYSIOGRAPHY. 



Clausthalite Cobalt-Bloom. 



Another sample gave, 

 Selenium 

 Copper 

 Lead 

 Silver 

 Oxide of lead and iron 



34-26 



15-45 



47-43 



1-29 



2-OS 



From Tilkerode, in veins of dolomite with Malachite, 

 iii. Seleniuret of Lead and Mercury. 



Sp. gr. = 7-3. 



Selenium - - - 24-97 



Lead ... 55-84 



Mercury ... 10-94 



Loss ... 2-25 



It gives when heated in an open tube a yellow sublimate of the 

 seleniate of mercury. 



It is found at the mine Tilkerode, engaged in dolomite. 



CLEAVELANDITE. (See Albite.) 

 COBALT-BLOOM. Diatomous Cob alt -Mica. 



Primary form. Right oblique-angled prism. M on T 

 = 124 51'. 



Secondary form. 



Fig. 138, 



The greater terminal edges are replaced by single 

 planes, and the lateral edges by two planes, k on k = 

 130 10'. s on 5 = 94 12'. / on /=11S 23'. 



