The crystal structure of mawbyite, PbFe2(AsO4)2(OH)2
- 1 October 1997
- journal article
- Published by Mineralogical Society in Mineralogical Magazine
- Vol. 61 (408) , 685-691
- https://doi.org/10.1180/minmag.1997.061.408.07
Abstract
The crystal structure of mawbyite, PbFe2(AsO4)2(OH)2 has been refined. The mineral is monoclinic, C2/m with a = 9.066(4), b = 6.286(3) c = 7.564(3) Å, β = 114.857(5)°, Z = 2; the structure has been refined to a conventional R = 4.3% using 361 observed reflections [I> 3σ(I)]. The structure contains chains of edgesharing Fe(O,OH)6 octahedra which are linked by AsO4 tetrahedra and Pb atoms in distorted square antiprismatic co-ordination. The hydrogen bonding network in the structure has been modelled using bond valence calculations. Mawbyite is confirmed to be isostructural with tsumcorite and dimorphous with carminite and the relationship between these two structures is discussed.Keywords
This publication has 4 references indexed in Scilit:
- The crystal structure of carminite: refinement and bond valence calculationsMineralogical Magazine, 1996
- Bond-valence parameters obtained from a systematic analysis of the Inorganic Crystal Structure DatabaseActa crystallographica Section B, Structural science, crystal engineering and materials, 1985
- Crystal structure refinement using a number of orthonormal axial systemsActa Crystallographica Section A, 1975
- The crystal structure of tsumcorite, a new mineral from the Tsumeb mine, S. W. AfricaActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials, 1973