106 Moses — Miner alogical Notes. 



tion, the other faces belonging definitely to three individuals. 

 Individual I, at the left, shows the well-developed faces z' (021), 

 s' (111) and p (101). Individual II, central, is a step above 

 individual I and shows the combination of faces a little far- 

 ther_from the crystal center, and also a slight development of 

 o' (221). Individual III, to the right, is composed of faces 

 still farther from the center and is essentially complete, show- 

 ing u, z, s, o, as well as u\ z', s ; , o\ but does not show p, which 

 is the most prominent plane on I and II. 



It would appear that during the growth of the crystal there 

 was some change in conditions which resulted in a partial 

 replacement of the comparatively smooth plane p (101) by the 

 deeply corroded faces of 0' (221). 



Measurements were only practicable with the hand goniome- 

 ter on account of the weight of the crystal. 





Measured. 



Recorded. 





Measured. 



Recorded. 



pb 



91° 



90° 



ff 



37° 



38° 36' 



ob 



106 



105 



pa' 



74 + 



74 30 



zb 



40 



41 25' 



oa' 



60 + 



6L 32 



sb 



59 



60 25 



za 



77 



79 36 



uu' 



49 



48 29 



sa' 



78 



76 34 



mm'" 



93 



92 50 



ua 



54 



53 58 



Columbia University, May 1901, 



