180 
MANGANESE DEPOSITS OF INDIA : MINERALOGY. [ PaRT I : 
localities at which manganese -garnet has been found in this 
district : — 
Avagudem, Chintejavalsa, Devada, Kantikapilli, Kodur, Kotakarra, 
Garbham, MamidipiUi. Perapi, Sandapuram, and Taduru, 
If this list be compared with the list given on page 1047, of locali- 
ties at which manganese-ore is fomid in this district, it will be seen that 
there are some localities at which spandite has not yet been fomid. This 
is probably only on accomit of the deposits not having been sufficient- 
ly opened up. Later on this garnet will doubtless be found in all these 
deposits, except ones ihat are purely detrital, such as Garividi. 
Probably owing to its igneous origin, from which one would expect 
a greater imiformity of composition and consequently 
a greater constancy of physical characters than in 
garnets of metamorphic origin, this mineral is much less variable 
than the spessartite of the Central Provinces. In size it is fairly 
uniform, seldom ranging outside the Umits of j-g and J inch in 
diameter. In spandite-rock, e.g., at Kodur, it occurs m granules 
averaging i J inch across. In this rock the granules are all 
pressed one against the other, so that they are boimded by flattish 
faces that do not, except perhaps occasionally by accident, conform 
to any particular crystallographic direction. In kodurite the spandite 
individuals, which are usually about to \ inch in diameter, are 
found both aggregated and as separate granules. These granules are 
either well rounded, or are partly bounded by small unrecognizable faces. 
They often show brilliant reflections both from the faces mentioned 
above and from fractures, the lustre being vitreous in the former case 
and resinous in the latter. The spandite varies in rocks from differ- 
ent localities from deep orange to orange-brown, orange-red, and blood- 
red, and never shows the yellow and lighter orange colours of the spes- 
sartite of the Central Provinces. Under the microscope these garnets 
show various tints of pale yellow, pale orange, and pale orange-brown, 
a brownish tint beine much more often seen in spandite than in spes- 
sartite. One mineral with which it may easily be confounded is the 
pyroxene mentioned on page 137, found in the manganese-pyroxenites. 
It is often impossible to determine without recourse to the microscope 
whether a particular grain in one of these rocks is a garnet or a 
pyroxene, so similar are they in their size, indefinite form, and orange- 
brown colour. 
