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GEOREF RECORD

Brochantite, Cu (sub 4) So (sub 4) (OH) (sub 6) ; OD character, polytypism and crystal structures

Stefano Merlino, Natale Perchiazzi and David Franco
Brochantite, Cu (sub 4) So (sub 4) (OH) (sub 6) ; OD character, polytypism and crystal structures (in Special issue dedicated to the memory of Luciano Ungaretti, Maria Chiara Domeneghetti (prefacer))
European Journal of Mineralogy (April 2003) 15 (2): 267-275

Abstract

Single-crystal XRD studies on brochantite demonstrate its order-disorder character; the structure is built of equivalent order-disorder layers with symmetry Pn2 (sub 1) m. Two maximum degrees of order (MDO) polytypes have been identified in brochantite from various localities. The MDO (sub 1) polytype corresponds with 'normal' brochantite P12 (sub 1) /a1, with a 13.140, b 9.863, c 6.024 Aa, beta 103.16 degrees , whereas the MDO (sub 2) polytype is monoclinic, P2 (sub 1) /n11 with a 12.776, b 9.869, c 6.026 Aa, beta 90.15 degrees . Given their polytypic relationships, the two MDO (sub 1) and MDO (sub 2) polytypes can be designated as brochantite-2M (sub 1) and brochantite-2M (sub 2) , respectively. The refined structure of brochantite-2M (sub 1) is in substantial agreement with earlier work; a structural model for the newly discovered 2M (sub 2) polytype is derived and has been refined to R 0.062.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 15
Serial Issue: 2
Title: Brochantite, Cu (sub 4) So (sub 4) (OH) (sub 6) ; OD character, polytypism and crystal structures
Title: Special issue dedicated to the memory of Luciano Ungaretti
Author(s): Merlino, StefanoPerchiazzi, NataleFranco, David
Author(s): Domeneghetti, Maria Chiaraprefacer
Affiliation: Universita di Pisa, Dipartimento di Scienze della Terra, Pisa, Italy
Pages: 267-275
Published: 200304
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 19
Accession Number: 2003-032468
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200311
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