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Zincalstibite-9R: the first nine-layer polytype with the layered double hydroxide structure-type

Mills, S. J. and Christy, A. G. and Kampf, A. R. and Housley, R. M. and Favreau, G. and Boulliard, J.-C. and Bourgoin, V. (2012) Zincalstibite-9R: the first nine-layer polytype with the layered double hydroxide structure-type. Mineralogical Magazine, 76 (5). pp. 1337-1345. ISSN 0026-461X.

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Zincalstibite-9R, a new polytype in the hydrotalcite supergroup is reported from the Monte Avanza mine, Italy. It occurs as pale blue curved disc-like tablets flattened on {001} intergrown to form rosettes typically less than 50 μm in diameter, with cyanophyllite and linarite in cavities in baryte. Zincalstibite-9R is uniaxial (−), with refractive indices ω = 1.647(2) and ε = 1.626(2) measured in white light. The empirical formula (based on 12 OH groups) is (Zn^(2+)_(1.09)Cu^(2+)_(0.87)Al_(0.04))_(Σ2.00)Al_(1.01) (Sb^(5+)_(0.97)Si_(0.02))Σ_(0.99)(OH)_(12), and the ideal formula is (Zn,Cu)_2Al(OH)_6[Sb(OH)_6]. Zincalstibite-9R crystallizes in space group R3İ, with ɑ = 5.340(2), c = 88.01(2) Å, V = 2173.70(15) Å^3 and Z = 9. The crystal structure was refined to R_1 = 0.0931 for 370 unique reflections [F_o > 4σ(F)] and R_1 = 0.0944 for all 381 unique reflections. It has the longest periodic layer stacking sequence for a layered double hydroxide compound reported to date.

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Additional Information:© 2012 The Mineralogical Society. Received 22 April 2012; Accepted 3 June 2012; Associate Editor: Elena Sokolova. An anonymous reviewer provided helpful comments on the manuscript and is thanked. Part of this study was funded by the John Jago Trelawney Endowment to the Mineral Sciences Department of the Natural History Museum of Los Angeles County. The microprobe analyses were supported by a grant to the California Institute of Technology from the Northern California Mineralogical Association. Sylvano Iob is thanked for providing the specimen for study.
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John Jago Trelawney Endowment UNSPECIFIED
Northern California Mineralogical AssociationUNSPECIFIED
Subject Keywords:zincalstibite, cualstibite, hydrotalcite, layered double hydroxide, LDH, polytype, crystal structure, Monte Avanza
Record Number:CaltechAUTHORS:20130122-085657179
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Official Citation: S. J. Mills, A. G. Christy, A. R. Kampf, R. M. Housley, G. Favreau, J.-C. Boulliard, and V. Bourgoin Zincalstibite-9R: the first nine-layer polytype with the layered double hydroxide structure-type Mineralogical Magazine, October 2012, v. 76, p. 1337-1345, published online 26 October 2012, doi:10.1180/minmag.2012.076.5.01
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36490
Deposited By: Ruth Sustaita
Deposited On:22 Jan 2013 17:23
Last Modified:19 May 2017 16:11

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