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 [Pbφ6] octahedra and [Pbφ8] bicapped trigonal prisms (φ = 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).

Crystal structure and revision of the chemical formula of georgiadesite, Pb4(AsO3)Cl4(OH)

PASERO, MARCO;
2000-01-01

Abstract

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 [Pbφ6] octahedra and [Pbφ8] bicapped trigonal prisms (φ = 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).
2000
Pasero, Marco; Vacchiano, D.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/167553
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