PHYSIOGRAPHY. 53 



Molybdic Ochre Monazite. 



3. It is generally found imbedded in granite or gneiss. It is not un- 

 frequently met with in repositories of Tin-Ore, and is accompanied also 

 by Wolfram. 



4. Among the oldest known localities of the present species, are Alten- 

 berg in Saxony, and Schlaggenwald and Zinnwakl in Bohemia. In these 

 places it occurs along with Tin-Ore ; in which connexion also, it is found 

 at Cornwall. Other foreign localities are, Norway, Sweden and Scot- 

 land. 



It is of frequent occurrence in the United States, where it is generally 

 found in gneiss. The most interesting localities are, Haddam and the 

 adjoining towns upon the Connecticut River, where it is found in the 

 quarries of gneiss, in crystals and large plates ; at Saybrook it is associa- 

 ted with Siilbite. Other localities are, Shutesbury, (Mass.) and Bovr- 

 doin, (Maine.) A very powerful vein of Molybdenite has lately been 

 found at Westmoreland, (Vt.) where it exists in granular masses of con- 

 siderable size, often free from the intermixture of other minerals. Asso- 

 ciated with it are found white crystals of Apatite. 



MOLYBDIC OCHRE. Molybdic Lusine-Ore. 



Massive : composition impalpable, pulverulent. 

 Color yellow. 



1. Fusible before the blow-pipe, attended with a white smoke. Heat- 

 ed on charcoal, it is partially absorbed, and on powdering and washing 

 the charcoal, grains of the reduced metal are discoverable. With salt 

 of phosphorus, it affords a green glass. It probably consists, when pure, 

 of oxygen 33-39, and molybdenum 66-"61 ; but ordinarily, it contains a 

 portion of the oxide of iron. 



2. It is found only in very minute quantities, attending the Molyb- 

 denite, at nearly all its localities. 



MONAZITE. Tetarto-prismatic Tungstic- 

 B a r y t e . 



Primary form. Doubly oblique prism, giving angles of 

 49 and 99. 



Lustre vitreous. Color, hyacinth or brick-red. Streak 

 white. Translucent on the edges. 

 5* 



