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Crystal structure of paralaurionite and its OD relationships with laurionite

Published online by Cambridge University Press:  05 July 2018

S. Merlino
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 1-56126 Pisa, Italy
M. Pasero
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 1-56126 Pisa, Italy
N. Perchiazzi
Affiliation:
Dipartimento di Scienze della Terra, Università di Pisa, Via S. Maria 53, 1-56126 Pisa, Italy

Abstract

The crystal structure of the rare lead hydroxychloride paralaurionite [PbCI(OH), monoclinic, space group C2/m, a = 10.865(4), b = 4.006(2), c = 7.233(3) Å, β = 117.24(4)°] has been refined to R = 0.062, Rw = 0.048. Its Order-Disorder (OD) character and its OD relationships with the orthorhombic polytpe of PbCI(OH), laurionite, are discussed. Laurionite and paralaurionite represent the two MDO structures within a family of OD structures built up by two different kinds of layers. The structures of paralaurionite and laurionite are compared thoroughly. The first coordination of the various atoms in the two polytypes is the same, however, remarkable differences exist in the connection between adjacent Pb-centred polyhedra.

Type
Crystal Structure
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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