670 
MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [PaRT IV : 
1841 1 in the basin of the Great Tenasserim River was shown by Mr. 
Piddington 2 to contain no manganese, and to be almost wholly carbon- 
aceous. 3 In the Museum there is a specimen from Mergui, of psilome- 
lane with limonite. Dr. Mason 4 says that manganese-ore occurs on 
some of the islands of the Mergui Archipelago, while Dr. J. Anderson 
collected specimens of impure manganese oxide, chiefly psilomelane, 
from Gna Islet, Padau Bay, King Island, in this archipelago. 5 
Some specimens of tin-store from Kumong, Maliwun, sent to the 
Geological Survey office for assay by Mr. T. W. H. Hughes, were found 
to contain large quantities of iron, manganese, and tungsten, derived 
from the wolfram mixed with the cassiterite.6 
Myingyan District. 
Mr. E. H. Pascoe, of the Geological Survey of India, in a paper about 
the Kabat Anticline, near Seiktein, in this district, writes : 7 — 
' Tn the extreme north of this fold, water- worn blocks and pebbles of a hard, im- 
jnire, detrital limestone occur in the stream-beds and on the summits and slopes of 
the hills. This interesting rock consists largely of bryozoan and foraminiferal tests, 
the material of which has been replaced by brown oxide of manganese, while their 
interstices and the space immediately surrounding them are commonly occupied 
by ferric oxide. Fragments of brachiopods, pelecypods and gastropods are fre- 
quent. Another prominent feature, is the occurrence of fragments — possibl}' peb- 
bles—of a felspathic sandstone, consisting of clear angular grains of felspar, often 
of large .size and frequently showing twin-lamcUation, with more or less accessory 
quartz, cemented together by oxide of manganese, which has in all probability 
replaced calcite, since this mineral formed the cementing material in a few cases. 
One pebble of a fine sandy clay was observed. The general cementing material of 
the rock as a whole is calcite, but there is so much manganese that the rock is 
quite dark in colour.' 
The age of these rocks is presumably Miocene, but possibly Pliocene, 
Ruby Mines District. 
Professor J. W. Judd,8 in describing the pegmatites of this area, 
says 'Epidote is often found developed along the cracks of these ortho- 
1 Jour. As. Soc. Beng., X, pp. 852-3 ; 
Cal. Jour. Nat. Hist., Ill, pp. 5r)-.56, (1843) ; 
Sel. Rec. Beng. Gori., VI, pp. 12-13,(1852). 
2 Jour. As. Soc. Beng., XVI, pp. 309-371, (1847). 
3 See also Mallet's Mineralogy, pp. 10 and 11, (1887). 
i The Natural Productions of Burmah, p. 48, (1850). 
5 Mallet's Mineralogy, p. 01, (1887). 
6 Bcc. Geo . Surv. Ind., XXIV, p. 135, (1891). 
7 Bee G. S. I., XXXIV. pp. 248, 249, (1906). 
8 Phi. Trans. Boy. Sot. London, Yol. 187 A, p. 197,(1896). 
