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Lead-antimony sulfosalts from Tuscany (Italy). III. Pillaite, Pb₉Sb₁₀S₂₃ClO_0.5, a new Pb-Sb oxy-chloro-sulfosalt, from Buca della Vena mine

¹ Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, I-56126 Pisa, Italy
² Laboratoire de Chimie des Solides, Institut des Matériaux J. Rouxel, UMR CNRS 6502, 2 rue de la Houssinière, 44322 Nantes Cedex 3, France

View larger version (100K): [in this window] [in a new window]   Fig. 1. Scanning electron microscope image of pillaite fibers.

View larger version (11K): [in this window] [in a new window]   Fig. 2. Reflectance curves of pillaite in air and oil.

View larger version (38K): [in this window] [in a new window]   Fig. 3. Bragg photograph obtained by rotation along the elongation axis b on pillaite single crystal, hkl indexing according to the weak 2b superstructure.

View larger version (66K): [in this window] [in a new window]   Fig. 4. Projection along b of the crystal structure of pillaite (half unit cell a/2 x c). In order of decreasing size: Pb (medium grey), (Pb, Sb) (cross-hatched), Sb (light grey), Cl (light grey), S (white) and O (black). Oxygen position is half-filled.