Original paper

Hinsdalite and plumbogummite, their atomic arrangements and disordered lead sites

Kolitsch, Uwe; Tiekink, Edward R. T.; Slade, Phil G.; Taylor, Max R.; Pring, Allan

European Journal of Mineralogy Volume 11 Number 3 (1999), p. 513 - 520

44 references

published: May 25, 1999
manuscript accepted: Feb 5, 1999
manuscript received: Jul 24, 1998

DOI: 10.1127/ejm/11/3/0513

BibTeX file

ArtNo. ESP147051103010, Price: 29.00 €

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Abstract The crystal structures of hinsdalite, PbAl3[(P0.69,S0.31)O4)]2(OH,H2O)6, and of a plumbogummite containing a small amount of arsenic, PbAl3[(P0.95,As0.05)O4)]2(OH,H2O)6, have been refined in space group /R3̅m, with a = 7.029(4) and c = 16.789(4) Å, and a = 7.039(5) and c = 16.761(3) Å, respectively. The refinements, using 258 (plumbogummite: 297) observed reflections with I ≥ 3σ(I), led to R = 3.0 % (3.7 %) and Rw = 3.0 % (3.2 %). Both minerals have the beudantite/crandallite structure type with hinsdalite being characterised by disordered (P,S)O4 tetrahedra with an average (P,S)-O distance of 1.52 Å. 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 Å in both minerals. The hydrogen-bonding networks are modelled with the help of bond-valence summations


hinsdaliteplumbogummitecrystal structureleadcrandallite group