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Canutite, NaMn3[AsO4][AsO3(OH)]2, a new protonated alluaudite-group mineral from the Torrecillas mine, Iquique Province, Chile

  • A. R. Kampf (a1), S. J. Mills (a2), F. Hatert (a3), B. P. Nash (a4), M. Dini (a5) and A. A. Molina Donoso (a6)...

Abstract

The new mineral canutite (IMA2013-070), NaMn3[AsO4][AsO3(OH)]2, was found at two different locations at the Torrecillas mine, Salar Grande, Iquique Province, Chile, where it occurs as a secondary alteration phase in association with anhydrite, halite, lavendulan, magnesiokoritnigite, pyrite, quartz and scorodite. Canutite is reddish brown in colour. It forms as prisms elongated on [20 ] and exhibiting the forms {010}, {100}, {10}, {201} and {102}, or as tablets flattened on {102} and exhibiting the forms {102} and {110}. Crystals are transparent with a vitreous lustre. The mineral has a pale tan streak, Mohs hardness of 2½, brittle tenacity, splintery fracture and two perfect cleavages, on {010} and {101}. The calculated density is 4.112 g cm−3. Optically, canutite is biaxial (+) with α = 1.712(3), β = 1.725(3) and γ = 1.756(3) (measured in white light). The measured 2V is 65.6(4)°, the dispersion is r < v (slight), the optical orientation is Z = b; X ^ a = 18° in obtuse β and pleochroism is imperceptible. The mineral is slowly soluble in cold, dilute HCl. The empirical formula (for tabular crystals from near the mineshaft), determined from electron - microprobe analyses, is (Na1.05Mn2.64Mg0.34Cu0.14Co0.03)∑4.20As3O12H1.62. Canutite is monoclinic, C2/c, a = 12.3282(4), b = 12.6039(5), c = 6.8814(5) Å, β = 113.480(8)°, V = 980.72(10) Å3 and Z = 4. The eight strongest X-ray powder diffraction lines are [d obs Å(I)(hkl)]: 6.33(34)(020), 4.12(26)(21), 3.608(29)(310,31), 3.296(57)(12), 3.150(28)(002,131), 2.819(42)(400,041,330), 2.740(100)(240,02,112) and 1.5364(31)(multiple). The structure, refined to R 1 = 2.33% for 1089 F o > 4σF reflections, shows canutite to be isostructural with protonated members of the alluaudite group.

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* E-mail: akampf@nhm.org

References

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Brown, I.D. and Altermatt, D. (1985) Bond-valence parameters from a systematic analysis of the inorganic crystal structure database. Acta Crystallographica, B41, 244247.
Burla, M.C., Caliandro, R., Camalli, M., Carrozzini, B., Cascarano, G.L., De Caro, L., Giacovazzo, C., Polidori, G. and Spagna, R. (2005) SIR2004: an improved tool for crystal structure determination and refinement. Journal of Applied Crystallography, 38, 381388.
Cameron, E.M., Leybourne, M.I. and Palacios, C. (2007) Atacamite in the oxide zone of copper deposits in northern Chile: involvement of deep formation waters? Mineralium Deposita, 42, 205218.
Cooper, M.A., Hawthorne, F.C., Ball, N.A., Ramik, R.A. and Roberts, A.C. (2009) Groatite, NaCaMn2+ 2(PO4)[PO3(OH)]2, a new mineral species of the alluaudite group from the Tanco pegmatite, Bernic Lake, Manitoba, Canada: description and crystal structure. The Canadian Mineralogist, 47, 12251235.
Gunter, M.E., Bandli, B.R., Bloss, F.D., Evans, S.H., Su, S.C. and Weaver, R. (2004) Results from a McCrone spindle stage short course, a new version of EXCALIBR, and how to build a spindle stage. The Microscope, 52, 2339.
Gutiérrez, H. (1975) Informe sobre una rápida visita a la mina de arsénico nativo, Torrecillas. Instituto de Investigaciones Geológicas, Iquique, Chile.
Hatert, F. (2006) Na1.50Mn2.48Al0.85(PO4)3, a new synthetic alluaudite-type compound. Acta Crystallographica, C62, i1–i2.
Hatert, F. (2008) The crystal chemistry of the divalent cation in alluaudite-type phosphates: a structural and infrared spectral study of the Na1.5(Mn1–xM2+ x)1.5Fe1.5(PO4)3 solid solutions (x = 0 to 1, M2+ = Cd2+, Zn2+). Journal of Solid State Chemistry, 181, 12581272.
Hatert, F., Keller, P., Lissner, F., Antenucci, D. and Fransolet, A.-M. (2000) First experimental evidence of alluaudite-like phosphates with high Li-content: the (Na1–xLix)MnFe2(PO4)3 series (x = 0 to 1). European Journal of Mineralogy, 12, 847857.
Hatert, F., Hermann, R.P., Long, G.J., Fransolet, A.-M. and Grandjean, F. (2003) An X-ray Rietveld, infrared, and Mössbauer spectral study of the NaMn(Fe1–xInx)2(PO4)3 alluaudite-like solid solution. American Mineralogist, 88, 211222.
Hatert, F., Rebbouh, L., Hermann, R.P., Fransolet, A.-M., Long, G.J. and Grandjean, F. (2005) Crystal chemistry of the hydrothermally synthesized Na2(Mn1–xFe2+ x)2Fe3+(PO4)3 alluaudite-type solid solution. American Mineralogist, 90, 653662.
Higashi, T. (2001) ABSCOR. Rigaku Corporation, Tokyo.
Kampf, A.R., Nash, B.P., Dini, M. and Molina Donoso, A.A. (2013a) Magnesiokoritnigite, Mg(AsO3OH)·H2O, from the Torrecillas mine, Iquique Province, Chile: the Mg-analogue of koritnigite. Mineralogical Magazine, 77, 30813092.
Kampf, A.R., Sciberras, M.J., Williams, P.A. and Dini, M. (2013b) Leverettite from the Torrecillas mine, Iquique Provence, Chile: the Co-analogue of herbertsmithite. Mineralogical Magazine, 77, 30473054.
Kampf, A.R., Nash, B.P., Dini, M. and Molina Donoso, A.A. (2014) Torrecillasite, Na(As,Sb)3+ 4O6Cl, a new mineral from the Torrecillas mine, Iquique Province, Chile: description and crystal structure. Mineralogical Magazine, 78, 747755.
Keller, P. and Hess, H. (1988) Die kristallstrukturen von O’Danielit, Na(Zn,Mg)3H2(AsO4)3, und Johillerit, Na(Mg,Zn)3Cu(AsO4)3. Neues Jahrbuch für Mineralogie, Monatshefte, 1988, 395404.
Krivovichev, S.V., Vergasova, L.P., Filatov, S.K., Rybin, D.S., Britvin, S.N. and Ananiev, V.V. (2013) Hatertite, Na2(Ca,Na)(Fe3+,Cu)2(AsO4)3, a new alluaudite-group mineral from Tolbachik fumaroles, Kamchatka peninsula, Russia. European Journal of Mineralogy, 25, 683691.
Mandarino, J.A. (2007) The Gladstone–Dale compatibility of minerals and its use in selecting mineral species for further study. The Canadian Mineralogist, 45, 13071324.
Pouchou, J.-L. and Pichoir, F. (1991) Quantitative analysis of homogeneous or stratified microvolumes applying the model "PAP". Pp. 31–75 in: Electron Probe Quantitation (K.F.J. Heinrich and D.E. Newbury (editors). Plenum Press, New York.
Rondeux, M. and Hatert, F. (2010) An X-ray Rietveld and infrared spectral study of the Na2(Mn1–xM2+ x)Fe2+Fe3+(PO4)3 (x = 0 to 1, M2+ = Mg, Cd) alluaudite-type solid solutions. American Mineralogist, 95, 844852.
Sheldrick, G.M. (2008) A short history of SHELX. Acta Crystallographica, A64, 112122.
Tait, K.T. and Hawthorne, F.C. (2003) Refinement of the crystal structure of arseniopleite: confirmation of its status as a valid species. The Canadian Mineralogist, 41, 7177.
Wright, S.E., Foley, J.A. and Hughes, J.M. (2001) Optimization of site occupancies in minerals using quadratic programming. American Mineralogist, 85, 524531.

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Canutite, NaMn3[AsO4][AsO3(OH)]2, a new protonated alluaudite-group mineral from the Torrecillas mine, Iquique Province, Chile

  • A. R. Kampf (a1), S. J. Mills (a2), F. Hatert (a3), B. P. Nash (a4), M. Dini (a5) and A. A. Molina Donoso (a6)...

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