Mineral description : Pollucite

Pollucite from Varuträsk, Västerbotten.

Mineral class Silicates : Tekto silicates : Nefeline leucite sodalite group
Chemical formula (Cs,Na)2(Al2Si4O12)*H2O
Crystal system Cubic
Habitus As grains and masses, rarely as crystals.
Cleavage  
Hardness 6.5
Density 2.86-2.90
Color Colorless to white, gray and slightly yellow. Transprent to translucent.
Streak  
Luster Vitreous to adamantine.
Description  
Occurance In lithium pegmatites.
Associates  
Notes The main ore of cesium.
Pollucite is soluble in concentrated sulfuric acid, it dissolves slowly in nitric acid and hydrochloric acid and separates out SiO2 after it's disintegration. It can dissolve quickly in phosphoric acid.
Locations A rare mineral in Sweden
  • Varuträsk, Västerbotten. As white or slightly yellow masses. Look for the oncosine veins, a positive sign of pollucite.
    A couple of tons have been mined here.
  • Viitaniemi, Finland.
  • Bernice lake, Manitoba. One of the largest deposits of pollucite. The deposit is estimated to contain about 300.000 tons of pollucite.

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