New secondary phosphate mineral occurrences and their crystal chemistry, at the Hagendorf Süd pegmatite, Bavaria
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Published:2022-10-10
Issue:5
Volume:34
Page:439-450
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ISSN:1617-4011
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Container-title:European Journal of Mineralogy
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language:en
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Short-container-title:Eur. J. Mineral.
Author:
Keck Erich, Grey Ian E., MacRae Colin M.ORCID, Boer Stephanie, Hochleitner Rupert, Rewitzer Christian, Mumme William G., Glenn A. MattORCID, Davidson Cameron
Abstract
Abstract. First occurrences from the Hagendorf Süd pegmatite of the secondary
phosphate minerals kenngottite,
Mn32+Fe43+(PO4)4(OH)6(H2O)2;
allanpringite, Fe33+(PO4)2(OH)3 ⚫ 5H2O; iangreyite,
Ca2Al7(PO4)2(PO3OH)2(OH,F)15 ⚫ 8H2O; and nizamoffite, MnZn2(PO4)2(H2O)4, are
reported with characterisation of their crystal chemistry and phase
associations. A synchrotron single-crystal structure refinement for
kenngottite shows that it has the same level of disordering (75 %/25 %)
of Fe3+ in adjacent octahedra along the 5 Å axis as for
type-locality kenngottite from Krásno, Czech Republic. This is explained
in terms of 1 : 1 fine-scale mixing of domains of ordered kenngottite-type and
souzalite-type structures. Allanpringite occurs in an unusual epitaxial
relationship to associated strunzite. The epitaxy is explained by the close
metrical and structural match of common planes in the two minerals, (010)
for allanpringite and (100) for strunzite. Iangreyite occurs in close
association with perhamite in 30 µm spheroids. The characterisation
results support a paragenesis of iangreyite from perhamite by selective
leaching of silica from the layer structure of perhamite and rejoining of
the layers by fusion of AlO4 tetrahedra from adjacent layers into
AlO2(OH)3 trigonal bipyramids.
Publisher
Copernicus GmbH
Subject
Pulmonary and Respiratory Medicine,Pediatrics, Perinatology and Child Health
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