Mineral description : Wermlandite

Light blue Wermlandite in calcite, from Långban.

Mineral class Carbonates : Bastnasite - Dawsonite group
Chemical formula (Ca,Mg)Mg7(Al,Fe+3)2(SO4)2(OH)18 12H2O
Crystal system Rhomboedral (trigonal).
Habitus As mica like flat crystals.
Cleavage  
Hardness 1.5
Density 1.93
Color Grayish green to light blue.
Streak  
Luster Silky.
Description  
Occurance As flat crystals in drusy calcite
Associates 0.1 mm big magnetite crystals, calcite.
Notes Type locality : Långban, Värmland, Sweden.
Discovered in 1971 by Moore.
Formerly known under the name "Yggerite".
Locations A rare mineral
  • Långban, Värmland, Sweden. As flat greenish gray crystals in druses in a coarse limestone cutting dolomite.

To carbonate index.
Mineral group index.
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Last changed : 1999-01-01