Chap. II.] list op manganese minerals. 29 
Table 2 — eontd. 
List of known manganese minerals with their chief properties. 
Name. 
' 
Formula. 
Crystalline 
system. 
specific 
oravitv 
Hardness. 
Manganophyl- 
lite ; 
1 
Biotite with 5-21% MnO. . 
V. 
•■• 
Alurgite . ! 
A manganese -mica 
V. 
2-83-3 
2-25-3 
Roscoelite 
Vajiadium mica some- 
times with Mn. 
2 -92-2 -94 
Caswellite (al- | 
tered mica). 
Ca, Mg, Mn, Fe, Al, silicate 
3-54 
2-5-3 
Other manga- | 
nese-micas. 
Salmite 
Mauganesian chloritoid 
VorVL 
3-38 
... 
Masonite 
Ditto 
Ditto . 
3-45 
... 
Ottrelite 
H2(Fe,Mn)Al2Si209. 
V. 
3-3 
6-7 
Manganchlorite 
Silicate of H, Al, Mg, with 
Mn. 
V. 
•• 
... 
Strigovite 
H4(Fe,Mii)2^Fe,Al)2Si20ii. 
•• 
314 
... 
Marjatskite . 
Manganese-glaucpnite 
Bementite 
2MnSi03.H20 
2-98 
Caryopilite 
4MnO.3SiO2.3H2O . 
. , 
2-83-2-91 
3-3-5 
Neotocite 
Hydrated silicate of Mn 
andFe. 
2-64-2-8 
3-4 
Titano- Silicates — 
Greenovite 
CaTiSiOswithMn 
V. 
(3-4-3-56) 
(5-6-6) 
Neptonite 
R'2 R" TiSi40i2, w th R' = 
Na, K, and R'=Fe, Mn* 
3-23 
5-6 
