462 
THE VOYAGE OF H.M.S. CHALLENGER. 
92. Phillipsite. — Station 276. 
Lat. 13° 28' S., long. 149° 30' W., 2350 fathoms (Dittmar). 
This specimen (which amounted to only a very few grams), when viewed under the microscope, appeared to 
consist matnly of tufts of yellow well-shaped crystals mixed with brown amorphous matter and black, roundish 
particles. I tried a variety of methods for isolating the crystals, such as treatment with cold dilute hydro- 
chloric acid, dilute sulphuric acid, oxalic acid, &c., but did not succeed ; the crystals themselves were too readily 
disintegrated by acids. On the other hand, even treatment with hot hydrochloric acid left more than mere 
hydrated silica ; I therefore decided upon separating the subtance into two parts by means of hot hydrochloric 
acid and analysing separately the disintegrated portion (including soluble silica of residue), and the de-siUcated 
resiilue. Such an analysis accordingly was started, but unfortunately it was lost through a serious oversight in 
the manipulation of the silicas, and not caring to risk the small remnant of substance that was left in compara- 
tively difficult processes, I simply analysed it as it was, i.e., without previously separating it into two jDarts. 
The first analysis served to check some of the numerical results, and as the agreements were satisfactory, the 
following analysis may be said to rest partly on double determinations. 
Sketch of Method of Analysis . — A known weight (0 6068 grm.) of air-dry powdered substance was placed in a 
platinum boat and dehydrated in a current of dry air, first at 100°, then at a red heat (within a combustion tube), 
the volatilised water, in the second case, being collected in a tared chloride-of-calciura tube. The residue was 
weighed, transferred to a platinum crucible, again weighed, and then ignited strongly, when it suffered an addi- 
1. In 
tional loss of weight. The residue was fused with carbonates of potash and soda aud analysed as 
a separate portion the alkalies were determined according to Lawrence Smith. 
• 
Found in 100 parts of substance ; — 
Per Cent. 
■ In multiples of eom- 
lining weights. 
Silica, .... 
57-85 
1-000 
Alumina, .... 
20-09 
0-203 
Ferric oxide. 
8-59 
0-0555 
Manganous oxide. 
2-51 
0-0362 
Lime, .... 
5-43 
0-1006 
Magnesia, 
..... 3-10 
0-0804 
Potash, . 
3-95 
0-0436 
Soda, .... 
1-31 
0-0218 
102-83 
Error, .... 
2-83 
100-00 
Water vol. at 100°, 
9-74 : 
H,0 = 0-5612 (a) 
Water vol. at redness. 
10-56 : 
H20= 0-6085 (5) 
Further loss at strong red heat, . 
4 -83 : 
H,0 = 0-2785 (c) 
S“ 125-13 
Assuming the “ FcjOg ” reported to have been FeO (in the substance), we have for the co-efficients of 
c b a 
SiOj 
AI.,03 
RO 
ILO, H„0 
H..,0 
1 
0-203 
0-328 
0 065 
0-2785 0-6085 
0-5612 
or SiOj 
A1.A 
RO 
R,,0 
II.,0 
5 
1-016 
1-64 
0-325 
7-24. 
or 6 
1 
2 
7 (about) 
The substance, then, would appear to be a kind of (mixed) zeolite, of the formula • 
A1,0"' ) 
2RO > 
£jHaO ; 
5SiOj + X Aq ; 
