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Formula: Ca4Mn2+Al4(PO4)6(OH)4.12H2O
Phosphate, manganese-bearing mineral
Crystal System: Monoclinic
Specific gravity: 2.58 measured
Colour: Colourless
Environments
Fanfaniite is a relatively new mineral, approved in 2018.
Localities
At the Hagendorf South Pegmatite, Hagendorf, Waidhaus, Neustadt an der Waldnaab District, Upper Palatinate, Bavaria,
Germany, fanfaniite occurs as isolated very thin laths on the surface of fibrous spheroids of
kayrobertsonite and associated with altered
triplite–zwieselite,
whiteite-(CaMnMn),
fluorapatite, nordgauite,
morinite, fluellite and
aluminium-bearing strunzite
(EJM 31.1.647-652, AM 106.9.1537-1543).
At the type locality, the Foote Lithium Co. Mine, Kings Mountain Mining District, Cleveland county, North Carolina,
USA, the secondary phosphate mineral fanfaniite forms
radial aggregates up to 0.5 mm in diameter of colourless, transparent, thin blades, associated with
whiteite-(CaMnMn),
zwieselite, triplite and
kayrobertsonite
(EJM 31.1.647-652, Mindat).
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