PHYSIOGRAPHY. 



Molybdenite. 



MOLYBDATE OF LEAD. (See Yellow Lead-Ore.) 

 MoLYBDENA-SiLVER. (See Bornite.) 



MOLYBDENITE. Rhombohedral Polypoione- 

 Glance. 



Primary form. Regular hexagonal prism. 

 Secondary forms. 



Haddam, (Conn.) 



Shutesbury, (Mass.) 



Fig. 311. Prmary form, with terminal edges replaced 

 by single planes. Fig. 312. The same, with the edges 

 between a truncated. 



Cleavage, parallel with P highly perfect. Fracture not 

 observable. Surface, P- smooth; the remaining planes 

 horizontally streaked. 



Lustre metallic. Color pure lead-grey. Streak un- 

 changed. Thin Iarnina3 are highly flexible. Very sectile. 

 Hardness =1-0... 1-5, Sp. gr. =4'59I. 



Compound Varieties. Massive ; composition granu- 

 lar, of various sizes of individuals. 



1. It does not melt, nor is it reduced before the blow-pipe, but it 

 emits sulphureous fumes, which are deposited on the charcoal. It de- 

 flagrates with ni r re, and is soluble with effervescence in nitric acid,, 

 leaving a grey residue. 



2. Analysis. 



By BUCHOL.Z. 



Molybdena - - - - , , " - ' 60 00 



Sulphur 40-00 



