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Formula: MnAl2(PO4)2(OH)2.6H2O
Hydrated phosphate, manganese-bearing mineral
Crystal System: Triclinic
Colour: Snow-white
Environments
Kayrobertsonite is a relatively new mineral, approved in 2015 and to date (May 2023) reported only
from its type localities.
Localities
There are two co-type localities, the Hagendorf South Pegmatite, Hagendorf, Waidhaus, Neustadt an der Waldnaab
District, Upper Palatinate, Bavaria, Germany, and the Foote Lithium Co. Mine, Kings Mountain Mining District,
Cleveland county, North Carolina, USA. At these localities kayrobertsonite crystals occur as intergrown
masses of snow-white, soft, finely fibrous needles, less than 5 μm in diameter and no more than 100 μm in length
(EJM 28: 649-654).
At Hagendorf associated minerals include
zwieselite-triplite,
fluorapatite, nordgauite,
whiteite-(CaMnMn), members of the
jahnsite group, morinite,
fluellite and aluminium-bearing
strunzite (HOM).
At the Foote mine associated minerals include spodumene,
mangangordonite,
variscite, eosphorite,
kastningite, paravauxite,
beraunite, strengite,
strunzite and cacoxenite
(HOM).
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