Mineral description : Heterosite

Heterosite from Varuträsk.
A small nodule above the blue tourmaline. Showing the brown oxidised surface.

Mineral class Phosphates : Vivianite - Skorodite - Triplite group
Chemical formula (Fe,Mn)(PO4)
Crystal system Orthorombic
Habitus As nodules and lumps.
Cleavage  
Hardness 4-4.5
Density  
Color Dark red, silky to matte. Often with a brown to black surface of oxidation products.
Streak Pale red.
Luster Silky to matte.
Description Heterosite is an oxidation product that represents the end member of the serie triphylite - ferrisicklerite - heterosite. It's the iron rich analog to purpurite.
Occurance  
Associates Ferrisicklerite, triphylite.
Notes The brown tarnish is easily removed with hydrochloric acid. Be careful, or you will ruin your sample.
Occurs often as irregular aggregates.
Locations A rare mineral in Sweden.

To phosphates index.
Mineral group index.
Main index.

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Last changed : 1998-06-02