1893. | NEW YORK ACADEMY OF SCIENCES. 103 
a— ©P ® (100). =P Gall), 
c —0P (001). - o — Pod (011). 
i= —=P. (aye 7 Poo Ol): 
e ==—-P& (101). y= 0 P 2 (210). 
y= +P (102). w= —9P2 (QN1), 
1 = 2Pe (201). 0 —1P = (103). 
m — ©P (110) m= ==) Pool i02)), 
Forms m,7 and o are less common, and uv and oarerare. The 
remaining faces are quite common to the species, not alone in 
this locality, but in general. On the “ bucklandite ” (allanite) 
of the Laacher See,* and later on the allanite from Vesuvius,t 
Dr. G. vom Rath has described a large series of forms, most of 
them being common on the Franklin crystals. 
W. C. Brégger} has determined the faces which occur on 
the allanite crystals of southern Norway. 
In the drawings accompanying this paper are shown the 
various combinations. They are all drawn from the actual 
crystal, and, as near as possible, in the same relative dimensions. 
Fig t 
Fig. 1 shows the simplest form, consisting merely of the basal 
pinacoid (c) OP (001), the ortho-pinacoid (a) % P © (100) and 
the prism (m) © P (110). This combination is rare. 
*G. vom Rath, Ueber die Krystallform des Bucklandits vom Laacher See,— 
Pogg Ann. Phys. and Ch., Vol. 113, p. 281. 
+ G. vom Rath, ibid., Vol. 158, p. 492. 
{ W. C. Brogger, Mineralien der sudnorweg. <Augitsyenit. Zeit. fur Krys. 
Xvi., 95, 1890. 
