216 



PHYSIOGRAPHY. 



Gadolinite. 



Secondary form.* 



Fig. 207. 



M on M' - 

 P on h 

 M on e 

 M on b 



115 e.g. 

 98 

 100 

 153 



b on&' 

 e on e f 

 6'one' 



120 



120 



130 



Cleavage, so imperfect, that its direction has not been as- 

 certained. Fracture conchoidal. 



Lustre vitreous, inclining to resinous. Color greenish- 

 black, very dark. Streak greenish-grey. Translucent or 

 the edges,. almost opake. 



Hardness =6-5 . . . 7-0. Sp. gr. =4-0 . . . 4-3. 



* The Abbe HAUY gives the following figure and measurements foi 

 this substance, which, however, are only claimed to be approximations 



Fig. 206. 

 M on I - ... - 143 



M on r - 



M on M - 



/ on I - 



I on r - 



I on s - 



r on s - 



r on u - 



