Mineral description : Triplite

Red triplite from Viitaniemi, Finland.

Mineral class Phosphates : Vivianite - Skorodite - Triplite group.
Chemical formula (Fe,Mn)2(F,PO4)
Crystal system Monoclinic.
Habitus As derb brownish red masses and coarse aggregates.
Hardness 4-5
Density 3.5-3.9
Color Dark brown, brown, brownish red to red.
Streak Gray, white to brown.
Luster Vitreous or resinous.
Occurance As derb masses in pegmatites, but also in high temperature vein occurences.
Associates Blue vivianite on the surface.
Notes Often with black tarnish on the surface.
Locations Some localities exists in Sweden.
  • Norrö mica quarry, Nynäshamn. As resinous aggregates together with triphylit.
  • Lilla Älgsjöbrottet, Kolmorden. As up to 10 cm big lumps, commonly.
  • Skrumpetorpsbrottet, Åmmeberg. As dark brown derb lumps, often covered in blue vivianite
  • Varuträsk, Västerbotten. Rarely, one 5mm thick vein with triplite covered in blue vivianite was found when the mine was active. No findings are reported in later years.
  • Viitaniemi, Finland.

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Last changed : 1998-06-04