Whitmoreite Locality: Hagendorf South Pegmatite (Cornelia Mine; Hagendorf South Open Cut), Hagendorf, Waidhaus , Vohenstrauß , Oberpfälzer Wald , Upper Palatinate , Bavaria , Germany ( Locality at mindat.org ) Picture width 2 mm. Collection and photograph Christian Rewitzer — Photo: Christian Rewitzer · CC BY-SA 3.0
Whitmoreite
Whitmoreite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Fe²⁺Fe³⁺₂(PO₄)₂(OH)₂·4H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/c). It is a member of the Arthurite structural group.
Key properties: Mohs hardness 3; specific gravity 2.87; Vitreous to subadamantine luster; optically biaxial.
IMA symbol Whm, IMA status: approved, named in 1974.
Found as a secondary mineral in complex zoned granite pegmatites.
It is found associated with Siderite, triphylite, ludlamite, strunzite, laueite, beraunite, mitridatite, ushkovite, Fe–Mn oxides.
The mineral was named to honor Robert William Whitmore (1936–), Weare, New Hampshire, USA, American collector of microscopic minerals and owner of the Palermo #1 mine.