General Information:
Chemical Formula:
Fe+++2(SO4)3·7(H2O)
Composition:
(Molecular Weight = 525.99 gm)
Iron 21.23 % Fe
Hydrogen 2.68 % H
Sulfur 18.29 % S
Oxygen 57.79 % O
Empirical Formula:
Fe3+2(SO4)3·7(H2O)
Environment:
Secondary mineral formed from the oxidation of iron sulfides.
Locality:
Szomolnok Copper Mine, Slovakia (Formerly Hungary).
Name Origin:
Named after Kornel Hlavacsek (1835-1914), hungarian mining engineer at the Szomolnok copper mine.
Physical Properties:
Cleavage:
[010] Imperfect
Color:
pale rose pink or violet.
Density:
2.306
Diaphaniety:
Transparent to translucent
Habits:
Acicular - Occurs as needle-like crystals., Encrustations - Forms crust-like aggregates on matrix., Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).
Luminescence:
None.
Luster:
Silky
Streak:
pale red
More details...