Mineral description : Lepidolite

Lepidolite from Varuträsk.
Crystals of lepidolite.
Lepidolite from Varuträsk.
Massive form.
Lepidolite from Varuträsk.
Two big crystals.

Chemical formula K2(Li3Al4)[Si7O21][OH,F]3
K2(Li3Al4)[Si6Al2O20][OH,F]4
Hardness 2.5
Density 2.8-2.9
Color rose, lilac, greygreen, transparent in thin sheets.
Luster glas, pearly.
Description Usually in cleavable plates or as granular masses.
Habitat Usually in pegmatites, sometimes in granites and gneisses.
Associates spodumene, amblygonite, zinnwaldite, beryl, lithium turmaline, cassiterite, muscovite, albite, topaz and niob / tantalum minerals.
Notes Colors the flame red and fuses to a white glass that are easily affected by acids.
Locations
  • Varuträsk pegmatite. As massive aggregates and crystals up to 2cm.
  • Haapaluoma in Finland.
  • Viitaniemi in Finland.
  • Tördalen in Norway ( 20 cm crystals ).

To silicate index.
Mineral group index.
Main index.

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axelsson@acc.umu.se
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Last changed : 1998-03-07