Class : Phosphates, arsenates, vanadates
    Subclass : Hydrated phosphates
    Crystal System : Triclinic
    Chemistry : Fe₃Al₄(PO₄)₄(OH)₆ 2H₂O
    Rarity : Very rare

Gormanite is a secondary phosphate that forms a series with souzalite, the magnesian term. It owes its name to Canadian mineralogy professor Donald Hermet Gorman of the University of Toronto. It is a very rare mineral which is formed preferentially in granitic pegmatites, but seems to be able to be satisfied with varied contexts since it is also found in the oxidation zone of ferriferous phosphate deposits and it is known exceptionally in tonalite fissures. It forms small elongated lamellar crystals, not exceeding one centimeter, frequently united in radial aggregates, of a dark blue-green color. It is a mineral intended only for the collection which is little known to the general public.

Main photo : Gormanite from Big Fish River, Yukon, Canada

This mineral twins around the {001} compositional plane and the [010] axis, but is not observable due to crystal size and morphology.