Chap. XXXVI.] 
N.\GPIIR : MANSAE. 
8«2 
In the Kamthi Lady Pit there is a most interesting set of rocks. One 
The Kiimtlii Lulv ^^J^^ composed of boautifu!, fresh, deep orange 
Pit. coloured, spessartite trapezohedra set in a matrix of 
pink rhodonite, white barytes, and a green phosphate, probably allied to 
dickin.sonite. The rhodonite, which is the commonest of these three 
minerals, often occurs in plates, up to an inch and more across, enclosing 
several spessartite crystals, which average ^ to |- inch in diameter. In 
many places this rock has been much altered, and then somewhat altered 
spessartites are set in a matrix of partly altered rhodonite, or of manga- 
nese-ore with a colour and lustre like that of lead — probably a variety 
of psilomelane allied to the mineral from Beldongri (the analysis of which 
corresponds to the formula, 6Mn3O5.Fe2O3.8H2O) that 1 have called 
beldongrite (see page 116). This manganese-ore has no doubt arisen by 
the chemical alteration, or replacement, as the case may be, of minerals 
forming the matrix in which the spessartite is set. In some bands where this 
altered matrix is soft, it is easy to separate the trapezohedral garnet 
crystals, and in this way some perfect trapezohedra have been obtained, 
the largest perfect one being f inch in diameter. Others are as large as 
1 inch in diameter. As showm in figure 14, page 172, these crystals 
have their faces striated parallel to the faces of the rhomb-dodecahedron. 
Some of the bands in this pit are composed entirely of spessartite and 
in one place the spessartite-rock has a rough columnar structure, like that 
of a small dyke, due to the spessartite individuals all being drawn out in a 
direction at right angles to the bedding. Figure 60 gives a rough section 
of the ore-body as seen here. 
Fig. 60.— Section across the Kainthl Lady Pit, CharsraoD. 
IV 
T 
