Mineral description : Fuchsite

Fuchsite from Horsmanaho, Finland.
With quartz and some sulphide.
Fuchsite from Åsengruvan.
Fuchsite from Altemark, Norway. In calcite.

Mineral class Silicates : Phyllosilicates : Mica group.
Chemical formula K(Al,Cr)2(AlSi3O10)(OH)2
Crystal system Monoclinic
Habitus Flakes and laminar aggregates.
Cleavage Perfect.
Hardness 2-2.5
Density 2.77-2.88
Color Emerald green.
Streak  
Luster Vitreous (glassy).
Description  
Occurance In schist, dolomites and basical rocks, as peridotites and serpentinites.
Associates  
Notes Fuchsite is not considered as an unique mineral. It is only a chromium rich variety of muscovite.
Locations A rare mineral in Sweden, but a few localities exists.
  • Pullerogruvan, Grängesberg.
  • Boliden, Västerbotten.
  • South of Pajala, Norrbotten.
  • Ruotasåive, north-west Karesuando, Lappland.
  • Handöl soapstone quarry, Jämtland.
  • Altemark, Mo i Rana, Norway. As thin layers in calcite.
  • Fauske, Norway. As green layers in marble.
  • Horsmanaho, Finland. Common as a green schist with quartz and sulphide.

To silicate index.
Mineral group index.
Main index.

If you have some questions, suggestions or comments you are welcome to write me a line or two.


axelsson@acc.umu.se
To my homepage.
Last changed : 1998-08-03