Calcioferrite 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 1,5 mm. Collection and photo Christian Rewitzer — Photo: Christian Rewitzer · CC BY-SA 3.0
Calcioferrite
Calcioferrite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Ca₄MgFe³⁺₄(PO₄)₆(OH)₄·12H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Calcioferrite structural group.
Key properties: Mohs hardness 2.5; specific gravity 2.51–2.53; Sulfur-yellow to white streak; Pearly on cleavages luster; optically biaxial.
IMA symbol Cfr, grandfathered status — known before the IMA’s founding, named in 1858.
Occurs as nodules in a bed of Tertiary clay (The Battenberg, Germany); in phosphatic clay (Moculta quarry, Australia).
It is found associated with Montgomeryite, jarosite, cacoxenite, tinticite, apatite, pyrite (Moculta quarry, Australia).
The name refers to CALCIum and iron, FERRum, in the composition.