398 



WHERRY AND ADAMS: PINAV^RDOI^ 



Schmidt two-circle goniometer. Some of them proved to be 

 very rich in forms, although the majority of these are extremely 

 minute, and would have been very difficult indeed to locate on 

 any other instrument. The coordinate angles of the 41 forms 

 observed are hsted in table i ; not quite all of them were ob- 



Fig. I. 



Fig. 2. 



Crystals of pinaverdol: Fig. i typical habit. Fig. 2 shows all forms observed. 



served on any single crystal, but all were obtained on a sufficient 

 number of crystals to regard them as thoroughly established. 

 The probable error of measurement in the case of the larger 

 forms is =t 5'. 



Typical combinations of these forms are shown in figures 1-4. 

 Figure i represents in orthographic and clinographic projections, 

 or plan and perspective, the typical habit of the bulk of the 

 crystals. The unit prism in (no) is the dominant form, with 

 narrow faces of the clinopinacoid b (010) in its zone. At rigth 

 angles to this zone lies that of the orthodomes, which are ap- 



