Chap. II. ] list of manganese minerals. til 
Table 2 — contd. 
List of known manganese mineraU with their chief 'properties. 
Name. 
Formula. 

Crystalline 
system. 
Specific 
gravity. 
Hardness. 
OrthosilicaUs — 
Helvite . 
Danalite 
(Mn,Fe)2(Mn2S)Be3(Si04)3 
(Fe,Zn,Mn)2 L(Zu,Fe)2S] 
Be3(Si04)3. 
I. Tetrahe- 
dral. 
I. . 
3 16-3 -36 
3 35-3 43 
6-6 -5 
5-5-6 
Mangan-gross- 
ularite 
3(Ca,iMn)O.Al203. 3Si02 . 
I. . 
3 "24 
Spessartite 
3]VlnO.Al203.3Si02 ■ 
I. . 
4 -0-4 -3 
6 -5-7 -5 
Spandite 
3{Ca,Mii)0.{Al,Fe)203. 
3Si02. 
1. . 
3 •8-4-1 
6-5-7-5 
AUochroite 
Polyadelphite 
Aplome 
Rothoflfite 
) Manganiferous varieties 
> of andraditc 
) 3CaO.Al203.3Si02. 
I. . 
•• 
•• 
Partschinite . 
(Mn,Fe)3Al2Si30i2 • 
V, . 
4-01 
6-5-7 
Glaucochroite 
CaMnSi04 
IV. . 
3-41 
6 
Hortonolite . 
(Fe,Mg,Mn)2Si04 
IV. . 
3-91 
6-5 
Knebelite 
(Fe,Mn)2S:04 
IV. . 
3 -9-4 -17 
6-5 
Tephroite 
Mn2Si04 
IV. . 
4-4 "12 
5-5-6 
Roepperite 
(Fe,Mn,Zn)2Si04 
IV. . 
3 "95-4 -08 
5-5-6 
Trimerite 
Troostite 
Friedslite 
(Mn,Ca)2Si04.Be2Si04. 
(Zn,Mn)2Si04 
H7(Mna)Mn4(Si04)4. 
VI (pseudo- 
Rhombohe- 
dral). 
III. Rhom- 
bohedral. 
Ditto . 
3*47 
3 •89-4 -IS 
3 -06-3 -07 
6-7 
5-5 
4-5 
Pyrosmalite . 
H7[ (Fe,Mn)ai (Fe,Mn)4(Si 
04)4. 
1 
Ditto . 
3 '06-3 '19 
4-4-5 
Basic Silicates — 
Mangan-vesu- 
vianite. 
Mangan-anda- 
lusite. 
Silicate of Ca,Al,Fe, with 
Mn. 
(Al,Mn)203.Si02 
IV. . 
IV. . 
(3 "35-3 -45) 
(3 •16-3-20) 
(6-5) 
(7-5) 
