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GEOREF RECORD

Crystal structure of mahnertite

Dmitry Yu. Pushcharovsky, Natalia V. Zubkova, Simon J. Teat, Elizabeth J. Maclean and Halil Sarp
Crystal structure of mahnertite
European Journal of Mineralogy (August 2004) 16 (4): 687-692

Abstract

Mahnertite, (Na (sub 0.88) Ca (sub 0.12) )Cu (sub 2.75) [AsO (sub 4) ] (sub 2) Cl (sub 0.62) 3.63 H (sub 2) O, M = 565.17, is tetragonal, with space group /4/ mmm,a = 10.037(1),c = 23.739(1) A,V = 2391.5(4) A 3 ,Z = 8, (super rho ) o = 3.32, rho c = 3.14 g/cm (super 3) , mu = 9.78 mm (super -1) . The crystal structure of mahnertite was solved and refined against data collected at the Daresbury S ynchrotron Radiation Source, using a 20 X 20 X 2 mu m (super 3) single crystal, lambda = 0.6898 A, F (000) = 2150, R = 0.049 for 639 reflections with I > 2 sigma (I). The structure consists of sheets parallel to (001), which comprise two symmetrically independent distorted Cu 5-vertex square pyramids Cu phi 5 (phi = O, Cl or H (sub 2) O) as well as AsO (super 4) tetrahedra. Four Cu phi 5 pyramids located around the 4-fold axis share edges to form clusters linked by AsO (super 4) tetrahedra. The sheets are linked by the common apical vertex of the Cu(2) Phi < 5 polyhedra. as a result, a heterogeneous framework is formed. (na, ca) atoms, additional cu(3) cations and H (super 2) O molecules are located in the interlayers. The mineral is structurally related to zdenekite, NaPbCu < (sub 5) (AsO (sub 4) ) (sub 4) Cl . 5H (sub 2) O.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 16
Serial Issue: 4
Title: Crystal structure of mahnertite
Affiliation: Moscow State University, Geology Department, Moscow, Russian Federation
Pages: 687-692
Published: 200408
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 14
Accession Number: 2007-037372
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
Secondary Affiliation: CCLRC Daresbury Laboratory, GBR, United KingdomMuseum d'Histoire Naturelle de Geneve, CHE, Switzerland
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200720
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