Hagendorfite Locality: Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua , Rafael Bustillo Province , Potosí Department , Bolivia ( Locality at mindat.org ) Size: thumbnail, 1.8 x 1.4 x 0.9 cm Hagendorfite Hagendorfite is a rare iron phosphate, and I personally have never seen one. However, this is an old piece purchased from David New's famous old mail order species lists, in 1976. Although small, it seems rich and well-crystallized with sharp clusters of crystals to 4mm. There is a hint of green-brown color, in person. Ex. John White Collection. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Hagendorfite
A monoclinic sodium-manganese-iron phosphate named for the Hagendorf pegmatite district of Bavaria.
Intro adapted from Wikipedia (CC BY-SA).
Hagendorfite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Na₂MnFe²⁺Fe³⁺(PO₄)₃.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Alluaudite structural group.
Key properties: Mohs hardness 4.5; specific gravity 3.71; refractive index 1.741; optically biaxial.
IMA symbol Hag, grandfathered status — known before the IMA’s founding, named in 1954.
Found in complex granite pegmatites; in phosphatic nodules in shale.
It is found associated with Triphylite, wolfeite, hematite (Hagendorf, Germany).
The name refers to Hagendorf, Germany, the locality which yielded the first specimens.