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Tondiite, Cu3Mg(OH)6Cl2, the Mg-analogue of herbertsmithite

Published online by Cambridge University Press:  05 July 2018

T. Malcherek ,
L. Bindi ,
M. Dini ,
M. R. Ghiara ,
A. Molina Donoso ,
F. Nestola ,
M. Rossi  and
J. Schlüter
T. Malcherek*
Affiliation:
Mineralogisch-Petrographisches Institut, Universität Hamburg, Grindelallee 48, D-20146 Hamburg, Germany
L. Bindi
Affiliation:
Dipartimento di Scienze della Terra, Universitá di Firenze, via La Pira, 4, I-50121, Florence, Italy
M. Dini
Affiliation:
Pasaje San Augustin, 4045 La Serena, Chile
M. R. Ghiara
Affiliation:
Centro Musei delle Scienze Naturali e Fisiche, Real Museo Mineralogico, Universitá di Napoli Frederico II, Via Mezzocannone, 8, I-80138 Naples, Italy Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, Universitá di Napoli Federico II, Largo san Marcellino 10. 80138 Naples, Italy
A. Molina Donoso
Affiliation:
Los Algarrobos, 2986 Iquique, Chile
F. Nestola
Affiliation:
Dipartimento di Geoscienze, Universitá di Padova, Via G. Gradenigo, 6, I-35131 Padua, Italy
M. Rossi
Affiliation:
Centro Musei delle Scienze Naturali e Fisiche, Real Museo Mineralogico, Universitá di Napoli Frederico II, Via Mezzocannone, 8, I-80138 Naples, Italy Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, Universitá di Napoli Federico II, Largo san Marcellino 10. 80138 Naples, Italy
J. Schlüter
Affiliation:
Mineralogisch-Petrographisches Institut, Universität Hamburg, Grindelallee 48, D-20146 Hamburg, Germany
*
E-mail: [email protected]
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Abstract

Tondiite, with the simplified formula Cu3Mg(OH)6Cl2, occurs as a rare supergene mineral in a phonolitic tephrite from the type locality, Vesuvius volcano, Italy, as well as associated with haydeeite in the Santo Domingo Mine, Arica Province, Chile. It is emerald green to bright green in colour and occurs in irregularly shaped crystals, often with stepped faces. Its calculated density is 3.503 g cm−3. Tondiite crystallizes with the herbertsmithite structure type, space group Rm. Lattice parameters are a = 6.8377(7) Å and c = 14.088(2)Å for the holotype material. The c parameter may vary with Mg/Cu ratio and the presence of impurity atoms. The five strongest lines in the calculated powder diffraction pattern are [d in Å(I)(hkil)]: 5.459(88)(101), 3.419(22)(110), 2.764(100)(112 3), 2.266(54)(024), 1.706(26)(220). Several tondiite crystals have been examined by single-crystal X-ray diffraction and by electron microprobe analysis. The observed Mg content ranges between 0.6 and 0.7 atoms per formula unit. The structural role of Mg is discussed.

Keywords

herbertsmithitenew mineralbasic copper chlorideVesuviusCaleta Vitorhaydeeite
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 3 , June 2014 , pp. 583 - 590
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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