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MANGANESE DEPOSITS OF INDIA : MINERALOGY. [ PaRT I : 
the containing rock being an epidote-hornblende-quartz-rock with sphene, 
apatite, tourmaline, and wollastonite. One occurrence of pyrite 
has been observed, namely in a hornstone-like 
Pyrite. chert vein at Kodegaon in the Nagpur district 
(see page 847). In one case, moreover, I have noticed what may be 
pyrrhotite. This was in a rock obtained as a loose block below the 
manganese-pjTOxenite outcrop at Taduru in the Vizagapatam district 
p hotite "^^^ composed of apatite, spandite, rhodonite, 
and quartz, with a little graphite and sphene. Under 
the microscope by reflected light a few scattered granules are to be seen 
of a opaque metallic bronzy mineral, which may be pyxrhotita. 
A case has been noticed of a fine white felt of sodium chloride or 
^ halite found as a coating on joint planes of the 
manganese-ore at the Kandri mine in the Nagpur 
district.! 
A mineral that is not infrequently found in association with man- 
^ ^ ganese-ore deposits in India is the rose-coloured 
ose quartz. variety of quartz. I have already noted two occur- 
rences in the Chhindwara district, namely at Khairi and Dudhara.2 
Other occurrences of this variety of quartz are as a vein in the 
decomposed lithomargic rocks at Kodur in the Vizagapatam district 
(see page 1062), and as large loose hexagonal crystals, of amethystine-rose 
colour, in the detritus or gravel deposits being sorted over for their 
loose fragments of manganese-ore at Sandanandapuram in the same 
district (see page 1075). The quartz associated with a piece of apatite- 
gondite at Guguldoho in the Nagpur district also exhibited a pale yet 
decided amethystine tint. Rose or amethystine-rose quartz is doubtless 
often found under circumstances when there are no strongly manganifer- 
ous rocks near by, but all the same one cannot avoid suspecting that 
the colouration may be connected with the possible presence of manganese 
in the quartz. Dana in his System of Mineralogy, page 187, puts forward 
this suggestion, whilst he also mentions that Fuchs found 1 to 1^% of 
titanium in rose quartz from Rabenstein near Bodenmais, and attributed 
the colour to this constituent. 
Some three years ago I made an examination of the Khairi rose 
quartz in conjunction with Mr. T. R. Blyth. We found that the quartz 
contained a very small quantity of manganese ; this could be extracted 
by boiling the very finely powered mineral with dilute sulphuric acid 
1 Bee. Qtol. SuV. Ind., XXXI. p. 237, (1904). 
2 Rte. Otol. Surv. Ind., XXXIII, p. 176, (1906). 
