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Mineralogical Magazine; October 2000; v. 64; no. 5; p. 879-884
© 2000 Mineralogical Society of Great Britain and Ireland
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Crystal structure and revision of the chemical formula of georgiadesite, Pb4(AsO3)Cl4(OH)

M. Pasero* and D. Vacchiano

Dipartimento di Scienze della Terra, Università di Pisa e CNR-CSGSDA, Via S. Maria 53, I-56126 Pisa, Italy

* E-mail: pasero{at}dst.unipi.it

The crystal structure of the rare secondary lead mineral georgiadesite has been solved from single-crystal X-ray diffraction data (R = 0.071). The structure can be visualized in terms of alternating puckered (100) layers of [Pb{phi}6] octahedra and [Pb{phi}8] bicapped trigonal prisms ({phi} = generic anion). Lead also occurs in irregular, lopsided polyhedra. This structural study shows unambiguously that arsenic occurs as As3+ and not as As5+. The chemical formula of georgiadesite has therefore been revised, on structural grounds, to Pb4(AsO3)Cl4(OH).

KEYWORDS: georgiadesite, crystal structure, lead halides, lone-pair effect, Laurion (Greece)






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