232 E. 8. Dona—Herderite from Maine. 
that all of these planes except the macropinacoid and the pyra- 
mid 4 occur on the Maine mineral, while with the latter there 
are eight not given for herderite. ‘The axial ratio given for 
herderite is: 
4:6: ¢=1: 15971: .0°6783 or 0°6261: 1]: 0°4247 
The following list will show how far the angles correspond : 
Maine phosphate. Herderite. 
63° 397 64° 7” 
re 110 «110, 
1-4 4 1-1, 011 011, 45 54 46°23 
: 6-% » 6-2, 061 ~ 061, 137 2 137 8 
Gwits; 001 ~ 111, 38 46 38 41 
0.3, 001 . 331, 67 27 67 25 
1-i «1-i 101 « 101, 68 37 68 18 
These angles are in the four principal zones and serve as well — 
as a much larger number to show the relation of the two 
confirmed those of Haidinger. Neither the variation habit 
nor in angle is, however, sufficient reason for separatin 
two minerals, but we must conclude that the results of 
the — 
f the 
pa i 
