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GEOREF RECORD

Crystal chemistry of lead oxide chlorides; I, Crystal structures of synthetic mendipite, Pb (sub 3) O (sub 2) Cl (sub 2) , and synthetic damaraite, Pb (sub 3) O (sub 2) (OH)Cl

Sergey V. Krivovichev and Peter C. Burns
Crystal chemistry of lead oxide chlorides; I, Crystal structures of synthetic mendipite, Pb (sub 3) O (sub 2) Cl (sub 2) , and synthetic damaraite, Pb (sub 3) O (sub 2) (OH)Cl
European Journal of Mineralogy (August 2001) 13 (4): 801-809

Abstract

The crystal structure of synthetic damaraite, Pb (sub 3) O (sub 2) (OH)Cl (orthorhombic, Pmc2 (sub 1) , a = 5.8052(7), b = 6.9025(8), c = 15.141(2) Aa, V = 606.7(1) Aa (super 3) ) has been solved by direct methods and refined to R1 = 0.039. The crystal structure of synthetic mendipite, Pb (sub 3) O (sub 2) Cl (sub 2) (orthorhombic, Pnma, a = 11.879(7), b = 5.808(4), c = 9.505(6) Aa, V = 655.8(7) Aa (super 3) has been refined to R1 = 0.049. Both structures are based on [O (sub 2) Pb (sub 3) ] double chains of edge-sharing OPb (sub 4) oxocentered tetrahedra that extend parallel to the a and b axes in damaraite and mendipite, respectively. In mendipite, the chains occur in two mutually perpendicular orientations, whereas, in damaraite, the chains occur in two orientations inclined to each other by F50 degrees . In mendipite, the chains are linked through weak Pb-Cl bonds only, whereas, in damaraite, the [O (sub 2) Pb (sub 3) ] chains are linked through OH(3) groups to form an [Pb (sub 3) O (sub 2) ](OH) sheet that is parallel to (010). Additional OH(4) groups in damaraite are attached to the [O (sub 2) Pb (sub 3) ] double chains. The OH groups in damaraite form two short (OH)-Pb bonds that results in (OH)Pb (sub 2) dimers. It is shown that (consistent with previous studies) OH (super -) -Cl (super -) substitution is likely to occur in damaraite and possible structural schemes for this substitution are outlined. Both mendipite and damaraite are members of the structural family of minerals and synthetic compounds that are based upon [O (sub 2) Pb (sub 3) ] double chains of (OPb (sub 4) ) oxocentered tetrahedra.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 13
Serial Issue: 4
Title: Crystal chemistry of lead oxide chlorides; I, Crystal structures of synthetic mendipite, Pb (sub 3) O (sub 2) Cl (sub 2) , and synthetic damaraite, Pb (sub 3) O (sub 2) (OH)Cl
Affiliation: St. Petersburg State University, Department of Crystallography, Saint Petersburg, Russian Federation
Pages: 801-809
Published: 200108
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 40
Accession Number: 2001-065617
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
Secondary Affiliation: University of Notre Dame, USA, United States
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 200120
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