CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
275 
BRAZIL. 
A kyanitic schist from Serra do Gigante, near Diamantina, was 
analyzed at the request of Prof. 0. A. Derby, who describes the rock 
in Anier. Journ. Sci., 4th ser., vol. 7, p. 343. Analysis by Hillebrand, 
record No. 1783. Contains kyanite, chlorite, sericite, quartz, and 
rutile. 
A. Bulk analysis of the schist. 
B. Portion soluble in hydrochloric acid. 
C. Portion soluble in strong sulphuric acid. 
D. Residue insoluble in sulphuric acid. 
The bracketed figures are deduced from other columns than the one 
in which they appear. 
Si0 2 
A1A 
Fe 2 3 
FeO 
MgO 
CaO 
Na 2 ( ) 
K 2 
H 2 at 105° . . 
H 2 above 105 
Ti0 2 
PA 
Zr0 2 
CoO, NiO 
MnO 
SrO 
Li 2 
S 
F 
38. 32 
28.16 
2.24 
4.02 
12.04 
.32 
.16 
1.11 
.55 
7.46 
4.93 
.47 
.09 
.04 
.16 
trace 
trace 
trace 
trace? 
10.78 
10.42 
[1. 78] 
[3.21] 
9.34 
.34 
[.03] 
.26 
[.55] 
5.36 
.10 
.47' 
trace 
(?) 
(?) 
(?) 
trace 
14.76 
14.77 
[2. 24] 
[4.02] 
[12. 04] 
.32 
[.03] 
[.26] 
[.55] 
6.80 
.20 
.47 
(?) 
[.04] 
[.16] 
(?) 
trace 
100. 07 
42.64 
56.66 
[23. 56] 
[13. 39] 
none 
none 
none 
.13 
.85 
.66 
[4. 73] 
[.09] 
trace 
43.41 
