The crystal structure of Ga-rich plumbogummite from Tsumeb, Namibia

Mills, S. J., Kampf, A. R., Raudsepp, M. and Christy, A. G. (2009) The crystal structure of Ga-rich plumbogummite from Tsumeb, Namibia. Mineralogical Magazine, 73 5: 837-845. doi:10.1180/minmag.2009.073.5.837


Author Mills, S. J.
Kampf, A. R.
Raudsepp, M.
Christy, A. G.
Title The crystal structure of Ga-rich plumbogummite from Tsumeb, Namibia
Journal name Mineralogical Magazine   Check publisher's open access policy
ISSN 0026-461X
1471-8022
Publication date 2009-11-30
Sub-type Article (original research)
DOI 10.1180/minmag.2009.073.5.837
Open Access Status Not yet assessed
Volume 73
Issue 5
Start page 837
End page 845
Total pages 9
Place of publication Middlesex, United Kingdom
Publisher Mineralogical Society
Language eng
Formatted abstract
Ga-rich plumbogummite, (Pb0.87,Ca0.13)Σ1.00H(Al1.95,Ga1.05)Σ3.00(PO4)2(OH)6, from Tsumeb, Namibia, has rhombohedral symmetry, space group R3m, with the cell parameters a = 7.0752(19) Å, c = 16.818(4) Å and V = 729.1(3) Å3. The crystal structure has beenrefied to R1 = 2.05%. Ga-rich plumbogummite has an alunite-type structure comprised of a rhombohedral stacking of (001) composite layers of corner-shared (Al,Ga)O6 octahedra and PO4 tetrahedra, with Pb atoms occupying icosahedrally coordinated sites between the layers. The Pb and H positions are discussed. Ga-rich plumbogummite is nonpleochroic, uniaxial (+), with indices of refraction, ε = 1.742(3) and ω = 1.722(3), determined in white light. The five strongest powder-diffraction lines [d in Å, (I/Io), (hkl)] are: 2.995, (100), (113); 5.766, (95), (101); 2.236, (43), (107, 122); 3.539, (38), (110); 1.919 (32), (303, 033).
Keyword Bond valence
Crystal structure
Gallium
Kintoreite
Namibia
Plumbogummite
Tsumeb
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth and Environmental Sciences
 
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