

TWO NEW MINERALS. 169 



specimen I found was in the cabinet of the School of Mines at 

 Paris ; there is another in the Yale College cabinet, and a third 

 in Prof. Shepard's collection. It exists as a thin yellowish, 

 apple-green coating, semi-transparent, easily detached from the 

 surface of the pitchblende, and is instantly recognized by heat- 

 ing it on a piece of platinum foil, when it loses water, blackens 

 at a red heat, and on cooling becomes orange-red. It also effer- 

 vesces violently with the strong acids, furnishing a test of 

 uranium and lime. A European locality being now known, 

 there will not be much difficulty in obtaining specimens. I 

 also think that I have found the medjidite from specimens 

 of the same locality ; but, not having such a marked test for 

 this mineral I could not decide on the little I obtained from a 

 specimen which is in the cabinet of the Garden of Plants. 



