Chap. V. ] 
MANGANESE-AMPHIBOLES. 
I4t 
From this it will be seen that the chief constituents are siHca, man- 
ganous oxide, magnesia, lime, and alkalies, the only constituents that 
are prominent in both dannemorite aiid richterite being the sihca and 
manganous oxide. Richterite and its varieties all come from Langban 
and Pajsberg in Sweden. 
We can now pass to the consideration of the Indian amphiboles 
found in the manganese-ore deposits and associated rocks, treating the 
yellow and greyish ones under the heading of dannemorite and the 
lilac and blue oudS under the heading of winchite, which, as will be shown 
below, is alhed to richterite. 
Yellow and Greenish-grey Amphiboles (Dannemorite?). 
The amphiboles of this group can for convenience be divided into 
two sections, those from the Central Provinces, and those from 
Kajlidongri, Central India. 
In the Central Provinces the following occurrences may be noted : — 
Balaghat district : — 
1. Cliikmara 
In gondite. 
Bhandara district :— 
2. Hatora 
Tn gondite. 
Chhindwara district : — 
3. Bichua 
4. Bichua 
6. Wagora 
In gondite. 
In rhodonite-gondite. 
In spessartite-rhodonite-rock. 
Xacrpur district : — 
0. Kandi-i 
7. Xandapuri . 
8. Satak T. 
9. Sitagondi 
10. Parsioni 
In gondite. 
In gondite. 
Tn gondite. 
In spe*sarti'e-rhodonite-rock. 
In orthoclase-rhodonite-gondite with 
rhodochrosite. 
11. Pali 
In piedmontite-gneiss (graniilit?). 
Central Provinces 
It will be seen from the above that the rock in which this amphibole 
usually occurs is gondite or spessartite-quartz-rock. 
but it also not unfrequently occurs in varieties con- 
taining rhodonite. The gondite may be either the fine or coarse-grained 
variety ; but is more usually the coarse-grained type, perhaps because the 
amphibole is more conspicuous in the coarser varieties and so more 
likely to be noticed and collected. In the coarse varieties the spessartite 
I n 2 
