Chap. XL. ] 
VIZAGAPATAM : GAUBHAM. 
1087 
The kaolinized felspathic rocks intorbanded with the manganese-ore 
and spa ndite -bearing rocks may be regarded as forming part of the ore' 
body ; Uke these, the equally intensely kaoli- 
Mauganeso-ore iu tho j^-^^j felspathic rocks lying to the north and 
' country. ' ^ jo 
south of the ore-body, and hence constituting 
the 'country,' have often been partly converted into wad, often in well- 
defined patches, as shown in Plate 51. In these black patches, as in 
those in the similar rocks forming part of the ore-body, a little 
manganese-ore has often developed, but rarely in sufficient quantity 
to be worth the cost of extraction, except where this ' country ' has 
to be quarried as part of the dead- work. 
Of the various rocks mentioned in the preceding paragraphs, both 
the apatite-quartz-spandite-felspar (quartz- 
Localities of spandite- kodurite) and the spandite-rock are to be found 
bearing rooks. ' ^ 
nearest their original condition in the northern 
parts of the deposit to the east of Hilltop. 
Tn the middle section the ore-body seems to be dipping straight 
, , down to the S.10°W. at 40° as shown in 
Sections across the deposit. 
Fig. 87. But the sections across the deposit 
S.1D.W. 
N.IO 
HILL 
TOP 
Scale :— 1"=100 feci. 
1. ' Country ' of kaolinized quartz-felspar-roek with wad. 
2. Not exposed, but probably same as 1. 
3. Wad and lithomargc with psilomelane. 
4. Wad and lithomargc with bands of psilomelane, usually the lead-like variety. 
5. Manganese-ore (psilomelane with mangan-magnetite) containing patches of brown chert. 
6. Kaoliniz?d quartz-fel spar-rock containing lenticular nodules of psilomelane 1-4 inches long. 
7. Psilomelane with included mangan-magnetite, and in many places irregular patches and layers 
of yellow ochre, white lithomargic spots, and thin partings of kaoliuized felspathic rock. 
Fig. 87. — Section across the middle of the Garbham mangauese-ore deposit. 
