480 
MEASUREMENTS OF CRYSTALS, 
QUARTZ. 
(Continued.) 
Fig. 152. 
P on a 
.. 145°22 / 
P on c 
. 165 30 
a on c 
. 159 50 
a on e 
. 175 30 
a on z 
. 137 51 
a on z" 
. Ill 15 
e on z 
. 145 30 
Figs. 157, 
158, 159, 160. 
P on a 
. 145°22 / 
P on c 
. 165 0 
P on t 
. 154 0 
QUARTZ. 
P 
" on t . 
. 103 
50 
a 
oiu . 
. 137 
51 
e 
on z . 
. 145 
0 
r 
on i . 
. 133 
50 
t 
on z . 
. 155 
0 
Fig. 161. A twin from Middleville, Her¬ 
kimer county. 
Fig. 161 (bis.) Two crystals crossing 
each other. It may be accidental. 
Fig. 162. 
P on or P' on 2 .... 103°20 / 
