General Information:
Chemical Formula:
K4Na4(Fe++,Zn)Fe+++6(SO4)12O2·20(H2O)
Composition:
(Molecular Weight = 2,189.12 gm)
Potassium 7.14 % K
Sodium 4.20 % Na
Zinc 1.49 % Zn
Iron 16.58 % Fe
Hydrogen 1.84 % H
Sulfur 17.58 % S
Oxygen 51.16 % O
Empirical Formula:
K4Na4Fe2+0.5Zn0.5Fe3+6(SO4)12O2·20(H2O)
Environment:
Volcanic exhalations.
Locality:
From Vesuvius and Cape Miseno, near Naples, Italy.
Name Origin:
Named from the Greek for "with" and voltine, because is was found associated with voltaite at the original locality.
Physical Properties:
Cleavage:
[0001] Perfect
Color:
greenish brown, yellow brown, orange brown, or lemon.
Density:
2.5
Diaphaniety:
Transparent to translucent
Habits:
Scaly - Morphology like fish scales., Tabular - Form dimensions are thin in one direction.,
Hardness:
2.5 - Finger Nail
Luminescence:
Fluorescent.
Luster:
Resinous
Streak:
brownish yellow
More details...