General Information:
Chemical Formula:
Fe+++16O16(OH)12(SO4)2
Composition:
(Molecular Weight = 1,545.76 gm)
Iron 57.81 % Fe
Hydrogen 0.78 % H
Sulfur 4.15 % S
Oxygen 37.26 % O
Empirical Formula:
Fe3+16O16(OH)12(SO4)2
Environment:
As a secondary precipitate forming crusts on material inundated by acidic (pH 3.2) drainage water.
IMA Status:
Approved IMA
Locality:
Pyhasalmi sulfide mine, Province or Oulu, Finland.
Name Origin:
In honor of Udo Schwertmann (1922 - ).
Physical Properties:
Color:
brownish yellow.
Density:
3.77 - 3.99, Average = 3.88
Diaphaniety:
Opaque
Habits:
Encrustations - Forms crust-like aggregates on matrix., Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).,
Hardness:
2.5-3.5 - Finger Nail-Copper Penny
Luminescence:
Non-fluorescent.
Luster:
Earthy (Dull)
Streak:
brownish yellow
More details...