• journal_title：Mineralogical Magazine
• Contributor：O. I. Siidra ; S. V. Krivovichev ; N. V. Chukanov ; I. V. Pekov ; A. Magganas ; A. Katerinopoulos ; P. Voudouris
• Publisher：Mineralogical Society of Great Britain and Ireland
• Date：2011-
• Format：text/html
• Language：en
• Identifier：10.1180/minmag.2011.075.2.337
• journal_abbrev：Mineralogical Magazine
• issn：0026-461X
• volume：75
• issue：2
• firstpage：337
• section：Articles

The crystal structure of new lead chloride arsenite, Pb₅(As³⁺O₃)Cl₇ [orthorhombic, Pbcn, a = 16.894(2), b = 10.913 (1), c = 16.760(2) Å, V = 3090.1(7) ų], from the historic slags of Lavrion, Greece, has been solved by direct methods and refined to R₁ = 0.069. The structure contains five symmetrically unique Pb, one As, eight Cl and three O sites. The As atom forms three nearly equal As–O bonds which result in the formation of an AsO₃ trigonal pyramid with As at the apex. The Pb1, Pb2, Pb3 and Pb4 atoms are bonded to the AsO₃ groups via Pb²⁺–O bonds to form complex [Pb₄(AsO₃)] chains parallel to the b axis. The Pb(5) atom is coordinated solely by Cl⁻ anions. The resulting Pb(5)Cl₇ polyhedra share common edges and corners to produce bent chains parallel to the c axis. A short compilation of structural features of known lead chloride arsenites is given.