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.
Hardness 1.5
Density 1.93
Color Grayish green to light blue.
Luster Silky.
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.

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Last changed : 1999-01-01