166 
MANGANESE DEPOSITS OF INDIA: MINERAI-OGY. [ PauT 1 
' manganese-grandite ' is open to the same objections, when it is neces- 
sary to use it in compound names of rocks, as ' manganese-garnet ' is 
(see page 164). The difficulty cannot always be obviated, as in the 
present case, unless the mineral be called grandite without the prefix 
manganese '. The advantage of the term manganese-grandite lies, of 
course, in its explicitness. 
In view of what has been written above I propose to refer to the 
manganese-garnets of the different areas in India as : — 
1. Spessartite ; in the rocks of the gondite series, i.e., in the 
Central Provinces, Jhabua, and Narukot. 
2. Spandite ; in the rocks of the kodurite series in the Vizagapatam 
district. 
3. Manganese-grandite . or more briefly grandite ; in the rocks, al- 
lied to the kodurite series, of the Ganjam district. 
4. Aplomc ; a special variety (see page 182). 
5. Caldtrite ; in the massive garnet-rock of Hazaribagh ( see page 182). 
6. Manganese-garnet ; in cases of considerable doubt as in pegmatites 
in the Central Provinces, where the character of the garnet has not been 
investigated, or in cases in which the mineral does not give a very 
marked reaction for manganese ; also sometimes in referring to any of 
the other garnets, to avoid the monotony in the constant repetition of 
the terms spessartite and spandite. 
I will now give below the analyses that have been made of Indian man- 
ganese-garnets. They are only two in number. The 
Analyses of Indian first was prepared for analysis by Mr. J. Coggin 
manganese-garnet?. -^^ i i i • , ,^ i i i i 
Brown by breaking up two or three trapezohedral 
crystals of spessartite from Chargaon in the Nagpur district, and 
carefully picking out those fragments that showed no trace of oxy- 
alteration, the crystals being always altered to a certain extent along 
cracks. The specific gravity was determined on the picked material, 
but the figures were unfortunately lost. Specimens of garnet from this 
locality, however, usually give values for this constant ranging from 
4*15 to 4'2 or a little over. The analysis was carried out by Mr. T. R. 
Blyth, the amount of material available for rhis purpose being not more 
than i a gramme, so that it was not possible to determine the state of 
oxidation of the manganese. The second also was picked for analysis 
by Mr. Brown, who also carried out the analysis. The rock from which 
the garnet was obtained was a specimen of spandite-rock from the 
Garbham mine in the Vizagapatam district, Madras. The material 
s<»parated had a rich red colour and specific gravity as determined 
