274 ANALYSES OF ROCKS, IT. S. GEOLOGICAL SURVEY. [no. 228. 
WEST INDIES. 
Volcanic ejectamenta from Mont Pelee, Martinique, and La Souf riere, 
St. Vincent, eruptions of Ma}', 1902. See Diller, Nat. Geog. Mag-., 
vol. 13, p. 285. Also Diller and Steiger, Science, vol. 15, p. 947. 
A. Pumice, Mont Pelee, eruption of May 8. Bandose- tonalose. 
Hypersthene-andesite, containing plagioclase, hypersthene, and mag- 
netite in a vesicular, glassy groundmass. 
B. Sand, same eruption as A, collected on deck of the steamer Boddam 
after its arrival at Santa Lucia. Tonalose-bandose. 
C. Dust, Mont Pelee, eruption of May 20. Tonalose. Collected 
on deck of steamer Potomac in harbor at Fort de France. B and C 
resemble A mineralogically. 
D. Volcanic dust from about 1 mile north of Georgetown, St. Vincent. 
Bandose. Collected by E. O. Hovey and not described in the articles 
cited above. 
E. Pumice from La Soufriere. Bandose. Collected by R. T. Hill. 
Hypersthene-andesite containing plagioclase, hypersthene, augite, 
olivine, and magnetite. (Diller.) 
F. Dust from La Souf riere. Banolose-placerose. Collected on steamer 
Coya, at sea, about 275 miles miles southeast of St. Vincent, May 71 
1902. Contains feldspars, pyroxenes, magnetite, and possibly other 
minerals. Contained 0.57 per cent of soluble salts. 
Analyses A to D by W. F. Hillebrand, record No. 1991. E and F 
by George Steiger, record Nos. 1984, 1989. 
Si0 2 .. 
A1A- 
FeA 
FeO.. 
MgO. 
CaO.. 
H 2 at 105° . . . 
H,0 above 105 c 
Ti0 2 
Zr0 2 
PA 
SO, 
s 
Fe 7 S 8 
MnO 
BaO 
61.07 
17.55 
2.13 
4.13 
2.26 
6.28 
3.50 
.98 
.23 
1.37 
.47 
trace? 
.15 
016 
. 21 
| .02 
Li 2 C) | trace 
100. 366 
B. 
60. 01 
17.54 
2.88 
4.30 
2.76 
6.80 
3. 41 
.89 
.10 
.30 
.45 
trace? 
.15 
trace 
.23 
.03 
trace 
99. 85 
C. 
63. 23 
16. 73 
2. 58 
3.12 
1.84 
6.01 
3.71 
1.11 
.17 
.48 
.40 
trace? 
.15 
trace 
.18 
.03 
trace 
99.74 
]». 
55.08 
18. 00 
2. 46 
4.57 
3. 34 
7.79 
3. 48 
.65 
.66 
1.39 
.80 
(?) 
.17 
.24 
.91 
.21 
trace 
trace 
99. 75 
E. 
55. 64 
18.21 
3. 63 
4.83 
3.48 
8.14 
3.55 
.58 
.20 
.54 
.98 
.11 
none 
.04 
19 
03 
100. 15 
F.a 
57.62 
19.76 
3.43 
3.90 
1.82 
6.45 
3.87 
.71 
.41 
.59 
.87 
.17 
.29 
.11 
08 
100. 
"Soluble in water; CaO, 0.20; Na.(), 0.08; S0 3) 0.29, unci a trace of CI, 
C< >;;, ( 1, NiO, SrO absent, except a trace of CI in F« 
