General Information:
Chemical Formula:
Mn++2V+++++(V+++++,As+++++)O7·2(H2O)
Composition:
(Molecular Weight = 707.40 gm)
Manganese 15.53 % Mn
Vanadium 45.01 % V
Arsenic 18.53 % As
Hydrogen 0.57 % H
Oxygen 20.36 % O
Empirical Formula:
Mn2+2V5+7(V5+0.75)7(As0.25)O7·2(H2O)
Environment:
In iron and manganese ores.
IMA Status:
Approved IMA
Locality:
The Fianel mine, Val Ferrera, Canton Graubunden, Switzerland.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[001] Good, [100] Good
Color:
orange red.
Density:
3.21 - 3.22, Average = 3.21
Diaphaniety:
Transparent
Habits:
Encrustations - Forms crust-like aggregates on matrix., ,
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Adamantine
Streak:
orange
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