CLARKE.] 
IGNEOUS AND CRYSTALLINE ROCKS. 
203 
C. Kaolinic alteration of the andesite, from a pit in the saddle 
between Halifax shaft and the Mizpah mine. Entirely altered to 
quartz, kaolin, and muscovite. 
D. The andesite, altered to chlorite and caJeite; Mizpah shaft, 675 
feet down. Contains chlorite, calcite, a little quartz, feldspar, sericite, 
hematite, zircon, and apatite. 
E. Hornblende- andesite, partly altered to orthoclase (?), Mizpah 
Hill. Ferromagnesian minerals completely decomposed. Some sec- 
ondary quartz is present. 
F. The andesite altered to quartz and muscovite, Mizpah vein. 
Little more than quartz and muscovite can be made out. 
6i0 2 
aia 
JFeA 
FeO 
MgO 
CaO 
Na 2 
K,0 
H, Oat 105°... 
H 2 above 105 c 
TiO, 
D0 2 
PA 
so, 
j|FeS 2 
MnO 
BaO. 
F... 
A. 
58.47 
16. 85 
2. 04 
3.12 
3. 84 
1. 35 
4.30 
3.14 
1.10 
3. 59 
. 77 
.52 
.35 
none 
4!) 
26 
11 
L2 
100. 42 
60. 45 
17.78 
5.86 
.25 
1.55 
1.04 
3.58 
2.11 
2.86 
2.93 
.81 
none 
.28 
none 
.06 
undet. 
.07 
99. 63 
71.14 
15.24 
1.77 
.26 
.16 
.09 
.24 
6.31 
.85 
2.87 
.48 
none 
.05 
.05 
.02 
undet. 
.17 
99.70 
E. 
55.60 
16.70 
2. 23 
3. 51 
2. 60 
4.27 
4.08 
3. 17 
.88 
3. 06 
.72 
2.76 
.28 
none 
none 
undet. 
.12 
99. 98 
73. 50 
14.13 
1.51 
.26 
.21 
.12 
.24 
5.11 
1.07 
2.81 
.47 
none 
.09 
.17 
.03 
undet. 
.19 
99.91 
14.66 
1.01 
.16 
.33 
.18 
none 
6.03 
.97 
2.95 
.44 
none 
.16 
undet. 
undet. 
undet. 
W.N7 
SrO not looked for. 
