OiiAP. XXX.] 
BELGATJM : TALKVADI. 
637 
if it be the case, then the explanation may be that, since lateritic mangan- 
ese-ores are as a general rule of better (lualitv the nearer the surface 
they lie, these included pieces may have been derived from the denuda- 
tion of the upper part of the ore-body noticed above and cemented to- 
gether by a second generation of laterite formed by percolating waters. 
This cementing laterite is chiefly ferruginous, but contains a little wad 
and a few thin veinlets of psilomelane that must be regarded as an in- 
tegral part of it, formed perhaps from those ])arts of the included man- 
ganese-ores noticed above as having been corroded away. 
Mr. C. Aubert has kindly supplied me with the analyses of various 
hand specimens from this neighbourhood shown in the following table. 
They were made by Dr. Pearson of London. 
Analyses of manganese-ores and manganiferous iron-ores from Talevddi. 
1 
2 
5 
6 
8 
9 
10 
11 
12 
13 
14 
.AI:u.K'iic-c> 
48-28 
35 
03 
8 
23 
12-84 
40-73 
39-91 
38 
68 
31-20 
48-16 
51 
42 
53 
48 
60-85 
Iron 
7-58 
16 
15 
51 
88 
47-22 
13-77 
14-37 
18 
38 
17-05 
8-82 
4 
96 
2 
13 
0-10 
Silica 
1-80 
1 
40 
2 
70 
1-85 
2-50 
1-80 
1 
40 
1-50 
0-70 
0 
70 
1 
55 
0-66 
Pii' sp ii nis 
0-05 
041 
0 
025 
0-021 
0 054 
0-029 
0 
152 
0-054 
0017 
0 
027 
0 
Oil 
0-119 
I was able to examine specimens that were said to be duplicates of 
those the analyses of which are given above. The mineral composition 
of these specimens was as follows :- - 
No. 1. — Manganese-laterite. 
No. 2. — Cavernous psilomelane -with limonite being replaced by psilomelane. 
No. 3. — Limonite and psilomelane mixed. 
No. 5. — Sample analysed was made up from two pieces, one of which was very 
hard limonite, while the other was cavernous manganese-laterite, composed of 
pyrolusit?, psilomelane, and yellow ochre. 
•No. 9. — Compact dull psilomelane with occasional cavities. 
No. 10. — Very cavernous and sooty psilomelane with a little pyrolusite. 
No. 11. — Similar to 10, but without pyrolusite. 
No. 12. — Dull psilomelane with ferruginous spots. 
No. 13. — Massive psilomalane with a thin ferruginous coating. 
No. 14. — Dull hard psilomelane with minute crystalline specks. 
