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GEOREF RECORD

Hinsdalite and plumbogummite, their atomic arrangements and disordered lead sites

Uwe Kolitsch, Edward R. T. Tiekink, Phil G. Slade, Max R. Taylor and Allan Pring
Hinsdalite and plumbogummite, their atomic arrangements and disordered lead sites
European Journal of Mineralogy (June 1999) 11 (3): 513-520

Abstract

The crystal structures of hinsdalite, PbAl (sub 3) [(P (sub 0.69) ,S (sub 0.31) )O (sub 4) )] (sub 2) (OH,H (sub 2) O) (sub 6) , and of a plumbogummite containing a small amount of arsenic, PbAl (sub 3) [(P (sub 0.95) ,As (sub 0.05) )O (sub 4) )] (sub 2) (OH,H (sub 2) O) (sub 6) , have been refined in space group R3m, with a = 7.029(4) and c = 16.789(4) A, and a = 7.039(5) and c = 16.761(3) A, respectively. The refinements, using 258 (plumbogummite: 297) observed reflections with I > or = 3sigma (I), led to R = 3.0 % (3.7 %) and R (sub w) = 3.0 % (3.2 %). Both minerals have the beudantite/crandallite structure type with hinsdalite being characterised by disordered (P,S)O (sub 4) tetrahedra with an average (P,S)-O distance of 1.52 A. The Pb atoms in both minerals are displaced from the origin and are disordered about their sites, as in other Pb containing members of the alunite family (beudantite, kintoreite, and plumbojarosite). The disorder of the Pb atoms is confined to the (0001) plane; in hinsdalite, Pb is at (0.0312,0.0312, 0.0), while in plumbogummite it is at (0.0409, 0.0409, 0.0). Pb-0 distances average 2.79 A in both minerals. The hydrogen-bonding networks are modelled with the help of bond-valence summations.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 11
Serial Issue: 3
Title: Hinsdalite and plumbogummite, their atomic arrangements and disordered lead sites
Affiliation: South Australian Museum, Department of Mineralogy, Adelaide, South Aust., Australia
Pages: 513-520
Published: 199906
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 44
Accession Number: 1999-046901
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
Secondary Affiliation: CSIRO Land and Water, AUS, AustraliaFlinder University of South Australia, AUS, Australia
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199916
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