Phosphosiderite Locality: Hagendorf South Pegmatite (Cornelia Mine; Hagendorf South Open Cut), Hagendorf , Waidhaus , Vohenstrauß , Oberpfälzer Wald , Upper Palatinate , Bavaria , Germany ( Locality at mindat.org ) Red Phosphosiderite between violet Strengite. Picture width 4 mm. Collection and Photo Christian Rewitzer — Photo: Christian Rewitzer · CC BY-SA 3.0
Phosphosiderite
A hydrated iron phosphate named simply for phosphorus and iron.
Intro adapted from Wikipedia (CC BY-SA).
Phosphosiderite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Fe³⁺(PO₄)·2H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/n). It is a member of the Phosphosiderite structural group.
Key properties: Mohs hardness 3.5–4; specific gravity 2.74–2.76; Vitreous to subresinous luster; optically biaxial.
IMA symbol Phsd, IMA status: approved, named in 1890.
Typically an alteration product of triphylite in zoned complex granite pegmatites; may be a component of soils; replacing bones or shells.
It is found associated with Triphylite, barbosalite, leucophosphite, laueite, huréaulite, strengite, turquoise.
The name comes from phosphorus and the Greek for iron in the composition.