General Information:
Chemical Formula:Fe+++16O16(OH)12(SO4)2
Composition:(Molecular Weight = 1,545.76 gm)Iron 57.81 %
FeHydrogen 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
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