PETROGRAPHY. 
47 
the so-called pseudoleucite, a mixture of orthoclase and nephelite. Small, mostly 
colorless haiiynes are seen here and there, with the customary dusty inclusions. 
SmaU prismatic anhedra of cegirite-augite and grains of magnetite are present in 
very small amount, and crystals of apatite and titanite are still more rare. Acting 
as a cement for these is some nephelite, which is the last product of crystallization. 
Chemical composition. An analysis of this type, published some years ago in 
incomplete form, is given in I below, with a number of additional determinations. 
Two of the few other analyses of beemerose rocks are also presented in II and III. 
Chemical Composition of Sabatinal Beemerose [Leucite-phonolite]. 
I. 
II. 
III. 
SiOj 
CC.8? O 
031 
CC.3S 
C.3. C6 
A1,O, 
20. 8? 
204 
23. 74 
2/1.4? 
Fe,O, . . 
2. 34 
QIC 
O. 6? 
2. IO 
FeO 
I. IO 
QIC 
1 . 26 
1 . 22 
MeO 
0.48 
OI2 
0.81 
O. 31 
CaO 
3.07 
OCC 
o 67 
I . 2/L 
Na 2 O 
4.81 
O77 
520 
6 48 
K a O 
10.40 
112 
IO OC 
9 CO 
H 2 O+ 
O. 34 
1 . 12 
O.03 
H 2 O 
0.38 
CO 2 
none 
O. O? 
TiO 2 .... 
o. 70 
.OIO 
trace 
ZrO 2 
0.07 
o 06 
P,Oc 
O. II 
.OOI 
o 06 
so,.. 
o. 14 
.OO2 
0.07 
Cl 
trace 
MnO 
n. d. 
n. d. 
BaO 
o.oo 
trace 
100.55 
99-57 
99.96 
So. er. . . 
2. I 
I. Sabatinal beemerose [leucite-phonolite]. Poggio Muratella, Lake Bracciano, Sabatinian 
District. Washington, analyst. Jour. Geol., V, 1897, p. 49. 
II. Grano-beemerose [nephelite-syenite]. Itschan, East Cape, Siberia. Washington, analyst. 
Am. Jour. Sci., XIII, 1902, p. 176. 
III. Grano-beemerose [nephelite-syenite]. Beemerville, Sussex County, New Jersey. Eakins, 
analyst. Iddings, Bull. U. S. Geol. Surv. No. 150, 1898, p. 211. 
Or 
Norm of I. 
. .62 .27 
Ab . 
. 3.67 
An 
. 4.73 
Ne 
19.32 
Th 
0.28 
Di 
2. CO 
Wo 
. 3. 02 
Ol 
O . OO 
Mt 
1.16 
11 
. I. C2 
Hm 
. I -44. 
Rest 
IOO.OO 
0.61 
70.67 
19.60 
4.12 
Class . 
Ratios of I. 
Sal 
90.27 
9-73 
Order- 
Rang. 
Subrang. . 
'Fern 
F 
'L 
K 2 O'+Na,O' 
CaO' 
'Na 2 O' 
9.27 
= 12.60 
i-45 
100.61 
