Skip to main content Accessibility help

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

  • S. J. Mills (a1), A. G. Christy (a2), A. R. Kampf (a3), R. M. Housley (a4), G. Favreau (a5), J.-C. Boulliard (a6) and V. Bourgoin (a6)...


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 (Zn1.09 2+Cu0.87 2+Al0.04)Σ2.00Al1.01(Sb0.97 5+Si0.02)Σ0.99(OH)12, and the ideal formula is (Zn,Cu)2Al(OH)6[Sb(OH)6]. Zincalstibite-9R crystallizes in space group R , with a = 5.340(2), c = 88.01(2) Å, V = 2173.70(15) Å3 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.


Corresponding author


Hide All
Bonaccorsi, E., Merlino, S. and Orlandi, P. (2007) Zincalstibite, a new mineral, and cualstibite: crystal chemical and structural relationships. American Mineralogist, 92, 198203.
Brese, N.E. and O’Keeffe, M. (1991) Bond-valence parameters for solids. Acta Crystallographica, B47, 192197.
Ciriotti, M.E., Möckel, S., Blass, G. and Bortolozzi, G. (2006) Cualstibite: ritrovamenti italiani. Micro, 1/2006, 1924.
Favreau, G., Berbain, C. and Meisser, N. (2003) Cyanophyllite et autres espéces rares de la mine du Tistoulet, Padern (Aude). Le Cahier des Micromonteurs, 4/2003, 1723.
Mills, S.J., Christy, A.G., Chen, E.C.-C. and Raudsepp, M. (2009) Revised values of the bond valence parameters for [6]Sb(V)-O and [3–11]Sb(III)-O. Zeitschrift für Kristallographie, 224, 423431.
Mills, S.J., Kampf, A.R., Housley, R.M., Favreau, G., Pasero, M., Biagioni, C., Merlino, S., Berbain, C. and Orlandi , P . (2012a) Om s i t e , (Ni,Cu)2Fe3+(OH)6[Sb(OH)6], a new member of the cualstibite group from Oms, France. Mineralogical Magazine, 76, 13471354.
Mills, S.J., Christy, A.G., Génin, J.-M.R., Kameda, T. and Colombo, F. (2012b) Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76, 12891336.
Patterson, A. L. (1934) A Fourier series method for the determination of the components of interatomic distances in crystals. Physical Review, 46, 372376.
Sheldrick, G.M. (2008) A short history of SHELX. Acta Crystallographica, A64, 112122.
Walenta, K. (1984) Cualstibit, ein neues Sekundärmineral aus der Grube Clara im mittleren Schwarzwald (BRD). Chemie der Erde, 43, 255260.
Wendel, W. and Bayerl, R. (2001) Typlokalität Grube Clara - Erstfunde aus vier Jahrzehnten. Lapis, 26(7/8), 5660.



Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed