INYOITE FROM NEW BRUNSWICK. 
3 
this regard owing to fritting caused by exudations from the skin. Nineteen 
selected individuals were separated from the matrix and measured on the 
two-circle goniometer and many others were studied under a binocular 
microscope once the crystal habit had been established. The measure- 
ments were carried along the principal zones and the orientation finally 
adopted is the same as that proposed by Schaller, and represented by the 
following gnomonic projection. 
This projection affirms the monoclinic character of the crystals as 
originally established by Schaller upon his California specimens. Twelve 
forms have been identified on crystals from Hillsborough — basal pinacoid, 
four prisms, two negative orthodomes, two clinodomes, and three pyramids. 
The zonal relations are extremely well defined and, apart from two of the 
domes, all the forms fall within the area limited by the unit pyramid. 
Calculation of the Elements. 
The crystals of inyoite from Hillsborough being characterized by well- 
developed forms perfectly adapted to measurement by the reflecting 
goniometer, it is not surprising that measurements made upon them show 
some differences from those made by Schaller upon cruder crystals with 
the contact goniometer. 
For the purpose of calculating the elements only such angular measure- 
ments as have been obtainable between faces showing very good reflection 
are employed. These measurements are, therefore, restricted to seven 
crystals showing the greatest measure of excellence. 
Averages of Measured Angles of Inyoite ( very good reflections ). 
Forms 
<p 
p 
c(001) 
90° 00' 
24° 11' 
b(010) 
00° 00' 
90° 00' 
a(100) 
90° 00' 
‘90° 00' 
m(110) 
51° 02' 
90° 00' 
z(120) 
31° 52' 
90° 00' 
k(011) 
32° 44' 
39° 27' 
. v(021) 
17° 46' 
55° 40' 
i(101) 
90° 00' 
22 d 32' 
h(201) 
90° 00' 
52° 04' 
P(lll) 
62° 02' 
55° 57' 
y(lil) 
31° 14' 
39° 05' 
*(312) 
67° 40' 
42° 25' 
From the above, seven equations were formed as follows: 
(A) 
p(lll) 
X' = 
1-30690 = 
P o '+e' 
for 8 values of X' 
(B) 
y(Tll) 
X' = 
-0-42113 = 
- ^'+e' 
for 4 values of X' 
(C) 
i(I01) 
X' = 
-0-41489 = 
- P ;+e' 
for 2 values of X' 
(D) . 
h(201) 
X' = 
-1-28300 = 
~2p'+e' 
for 4 values of X' 
(E) 
c(001) 
X' = 
0-44906 = 
e' 
for 7 values of X' 
(F) 
v(021) 
X' = 
0-44676 = 
e' 
for 5 values of X' 
(G) 
k(011) 
X' = 
0-44495 = 
e' 
for 2 values of X' 
