30 MANGANESE DEPOSITS OF INDIA : MINERALOGY. [ ParT I : 
Table 2 — conld. 
List of known manganese minerals with their chief properties. 
Name. 
Formula. 
Crystalline 
system. 
specific 
gravity. 
Hardness. 
Hellandite 
Ca2 R"'3(R'"0)3 (Si04)4. 
Fe,Mn. 
.. 
Astrophyllite . 
(Na,K)4 (Fe,lMn)4 Ti(Si04)4 
IV. 
3 
Lamprophyllite 
Contains Na,Fe,5In,Ti, and 
Si02. 
IV. 
3-45 
N {abates and 
^ tfYtf/i] nip ? 
Colnmbite and 
Tantalite. 
(Fe,Mn)(Nb,Ta)206. 
IV. . 
5-3-7-3 
6 
Manganocolum- 
bite. 
MnNb206.MnTa206. 
IV. . 
6-59 
Manganotan- 
talite. 
MnTa206 
IV. . 
7-30 
Hielmite 
Stanno-tantalate of Y, Fe, 
Mn and Ca. 
IV. . 
5-82 
5 
Phosphate * and 
Arsenalec — 
Berzeliite 
(Ca,Mg,Mn)3As208 
I. 
4 07-4-09 
5 
Soda-berzeliite 
(Ca,Mi\,Na2)3As208. 
I. 
4 -21 
4-4 5 
Caryinite 
(Pb,Mn,Ca,Mg)3As208? 
V(?) . 
4-25-4-29 
3-3-5 
Triphylite 
Lithiophilite . 
Li(Fe,Mn)P04 
, Li(Mn,Fe)P04 
\ IV. . 
1 
3-42-3-56 
4-5-5 
Natrophilite . 
NaMnPOi 
IV. . 
3-41 
4-5-5 
Graftonite 
(Fe,Mn,Ca)3P208 
V. 
3-67 
5 
