810 
MANGANESE DEPOSITS OP INDIA : DESCRIPTIVE. [ PaRT IV : 
Sample No. 64 was taken all along the outcrop on the Mansakra ridge. It 
consisted mainly of the cherc-Uke limonite, which often showed a certain (juantity 
of m;inganese-orc in streaks and in cavities, the ore consisting of both psilomelano 
and pyrolusitt?. Some of the ore was rather clay-like and one piece consisted of 
soft yellow limonite with streaks of psilomelane and included angular quartzite. 
Analysed at the Imperial Institute. 
Sample No. 65 was taken from the outcrop of Hmonite on the ridge situated 
about 1 mile E. N. E. of Sihora railway station, at the north end of the ridge. 
The sample consisted of limonite, oftf>n with psilomelane veins ; one or two pieces 
showing remains of original micaceous hematite ; and one piece red earthy hema- 
tite. Analysed at the Imperial Institute. 
Sample A.8 was taken all along the top of Kasai Hill. The original sample 
was divided into two, one consisting of the manganese-ore (sample A. 9, not 
analysed), and the other [\. 8) of limonite rendered manganiferous by the presence 
of a certain number of psilomelane veins. Ths limonite shows the usua] 
slaty structure, and, sometimes, stringers of radiated hard shining limonite- 
Anxlysed by Messrs. J. on ). H. S. Pattinson. 
It will now be necessary to refer to the rock I have called lateritoid 
in the second part of this Memoir. The term 
Lateritoid. i ■ ■ i i i i 
lateritoid, it may be remembered, was mtro- 
dr ced to describe those forms of manganese and iron-ore — formed on the 
outcrop of the rocks of the Dharwar formation — that have some resem- 
blance to the rocks usually called laterite ; but which are nevertheless 
distinct from what is usually referred to as laterite by most geologists. 
Lateritoid is usually distinguished by containing residual fragm.ents of 
the rock from which it has been derived by replacement, these fragments 
being merely the portions of the original rock that have escaped re- 
placement at the time of formation of the lateritoid. From this point 
of view, therefore, all th° pyrolusite, psilomelane, and manganiferous 
limonites and hematites to which reference has been made in the 
preceding pages should be classed as lateritoid. 
In addition to the occurrences of manganese-ore that may be 
grouped under the term lateritoid, there are 
Manganese in laterite. , • i , ^ ■, -, r .^ 
also some m what must oe regarded for the 
present as true Za^m'te. Someof the pyrolusite near Gosalpur occurs in 
the laterite that obscures a portion of the Dhjirwilr (Gosalpur) rocks of 
that neighbourhood. The manganese-ore that occurs in the laterite is 
not, however, of much importance as compared with the lateritoid 
occurrences of manganese-ore. The most notable occurrenpe is at 
