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Crystallographic ordering of aluminium in laueite at Hagendorf-Sud

I. E. Grey, E. Keck, W. G. Mumme, C. M. MacRae, J. R. Price, A. M. Glenn and C. J. Davidson
Crystallographic ordering of aluminium in laueite at Hagendorf-Sud
Mineralogical Magazine (April 2015) 79 (2): 309-319


Crystals of laueite, Mn (super 2+) Fe (super 3+) (sub 2) (PO (sub 4) ) (sub 2) (OH) (sub 2) .8H (sub 2) O, from the Cornelia mine open cut, Hagendorf Sud, Bavaria, are zoned due to aluminium incorporation at the iron sites, with analysed Al (sub 2) O (sub 3) contents varying up to 11 wt.%. Synchrotron X-ray data were collected on two crystals with different Al contents and the structures refined. The laueite structure contains two independent Fe (super 3+) -containing sites; M2 and M3, which alternate in 7 Aa corner-connected octahedral chains. The coordination polyhedra are different for the two sites, M2O (sub 4) (OH) (sub 2) and M3O (sub 2) (OH) (sub 2) (H (sub 2) O) (sub 2) respectively. The structure refinements show that Al preferentially orders into site M3. Refined site occupancies for M2 and M3 for the two crystals are: for crystal L-1, M2 = 0.70(1) Fe + 0.30(1) Al, M3 = 0.54(1) Fe + 0.46(1) Al and for crystal L-2, M2 = 0.67(1) Fe + 0.33(1) Al, M3 = 0.48(1) Fe + 0.52(1) Al. For crystal L-2, the octahedral chains have dominant Fe in M2, alternating with dominant Al in M3 along the chain, an ordering phenomenon not previously reported for laueite-related minerals.

ISSN: 0026-461X
EISSN: 1471-8022
Serial Title: Mineralogical Magazine
Serial Volume: 79
Serial Issue: 2
Title: Crystallographic ordering of aluminium in laueite at Hagendorf-Sud
Affiliation: CSIRO, Mineral Resources, Clayton, Victoria, Australia
Pages: 309-319
Published: 201504
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 38
Accession Number: 2015-070047
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
N47°40'00" - N50°34'60", E09°30'00" - E13°45'00"
Secondary Affiliation: Australian Synchrotron, AUS, Australia
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201530
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