PETROGRAPHY. 
Chemical Composition oj Paglial Procenose-pulaskose [Leucite-trachyte]. 
43 
I. 
II. 
III. 
SiO 2 
CC.O7 O 
Ql8 
<C 7 . 60 O 
060 
A1 2 O 3 
20.83 
2O4 
TO. A.1 
IOO 
Fe,O, 
2. 12 
OI7 
2 .A.Q 
016 
FeO 
I. 00 
028 
1 .02 
026 
8 17 
MeO . 
I . OO 
02? 
I. 06 
O2 7 
CaO 
}. 27 
060 
A. 17 
O7C 
4 80 
Na,O 
4-OO 
06 q 
3- IS 
OC7 
i 02 
K 2 O 
8.6"; 
O93 
8.71 
OO? 
H 2 O+ 
o. 77 
o. 32 
H 2 O 
o. so 
o. 32 
i-54 
co a 
none 
TiO a 
0.82 
OIO 
0.46 
OO6 
ZrO 2 
0.04 
p,o c 
o. 19 
OOI 
o. 20 
OOI 
SO 3 
trace 
o 64 
Cl 
0.04 
trace 
(Ce,Di) 2 O, . 
o.o? 
MnO 
n.d. 
0.23 
.OO? 
O. A.A. 
BaO 
o. 20 
SrO 
0.06 
99-73 
100.50 
IOO.27 
I. Paglial procenose-pulaskose [leucite-trachyte]. Below castle, Proceno, N. W. of Lake 
Bolsena, Vulsinian District. Washington, analyst. 
II. Bolsenal vulsinose-pulaskose [vulsinite]. Rotondella, Astroni Volcano, Phlegrean Fields. 
Riva, analyst. De Lorenzo and Riva, Alt. Ace. Sc. Nap., XI, 1902, p. 52. 
III. Paglial pulaskose? ["leucite-tephrite"]. Below castle, Proceno. Ricciardi, analyst. Klein, 
Neu. Jahrb., B. B. VI, 1889, p. 26. 
Or. 
Ab. 
An 12. 79 
Ne 10. 79 
Di.. 2.22 
Norm of I. 
78-65 
01. 
Mt 
II.. 
Ap. 
Rest. 
i-35 
1.52 
Q-34 
97.89 
1.69 
99-58 
10.79 
j 3-57 
89.44 
4-54 
o-34 
Ratios. 
Norm of II. 
5I-7 1 
19.12 
81.95) 
II. 12 
) [87.77 
5.82 
5.82) 
6.83 
6.83 
3-7i 
4.62 
11.79 
0.91 
0.36 
0.36 
99-58 
1.09 
Class 
Sal 
10. c6 
Order 
Fem 
F 
7- 29 
L 
K 3 O' + Na 2 O' 
3 . 4-3 
Subrane. . . 
CaO' 
K 2 O' 
i.43 
100.67 
II. 
7-44 
14.08 
3-75 
1.63 
