480 



MEASUREMENTS OF CRYSTALS. 



aUARTZ. (Continued.) 



Fig. 152. 



P oii« 145°22' 



P one 165 30 



a one 159 50 



a on e 175 30 



a on z ., 137 51 



a onr" Ill 15 



e onz 145 30 



Figs. 157, 158, 159, 160. 



Pona 145°22' 



Pone 165 



Font 154 



aUARTZ. 



P" ont 103 50 



a onz 137 51 



e on zr 145 



ront ] 33 50 



t on z 155 



Fig. 161. A twin from Middleville, Her- 

 kimer county. 

 Fig. 161 {bis.) Two crystals crossing 



each other. It may be accidental. 

 Fig. 162. 



P onz'orP'onz .... 103°20' 



