Home Physical Sciences Ni-serpentine nanoflakes in the garnierite ore from Campello Monti (Strona Valley, Italy): Népouite with some pecoraite outlines and the processing of Ni-containing ore bodies
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Ni-serpentine nanoflakes in the garnierite ore from Campello Monti (Strona Valley, Italy): Népouite with some pecoraite outlines and the processing of Ni-containing ore bodies

  • Gian Carlo Capitani EMAIL logo and Gennaro Ventruti
Published/Copyright: March 31, 2018
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Abstract

The garnierite ore at Campello Monti occurs as dark green colloform concretions covering surfaces, fractures, and filling veins in harzburgite rocks. The representative composition (Ni2.45Mg0.14Cu0.12Co0.05)Σ2.76Si2.10O5(OH)4 is consistent with a 7 Å phase, namely pecoraite or népouite. Relevant chemical features are an exceptionally high Ni/Mg ratio, a significant level of Cu substituting for Ni, and a low content of S, possibly in tetrahedral sites.

Olivine and orthopyroxene in the harzburgite host rock are only partially serpentinized, do not contain detectable Ni, and are almost iron free. The green coating probably originated from groundwater solutions that leached nearby weathered peridotites and sulfide ores, and deposited less-mobile elements along fractures and voids of the host peridotite, just outside their provenance area.

Bulk techniques such as X-ray powder diffraction and infrared spectroscopy do not confidently distinguish between népouite and pecoraite, although the comparison with synthetic, implicitly pure polymorphs indicates népouite as the best matching phase. On the other hand, HRTEM clearly shows that garnierite is mostly constituted by plumose aggregates made of curved crystals with frayed tips, a few nanometers thick along the stacks and a few tens of nanometers long (nanoflakes). All known lizardite stacking sequences, namely 1T, 2H1, and 2H2, have been locally observed, even though most crystals show stacking disorder.

The recorded nanostructure suggests possible explanations for the recurrent anomalies (low oxide totals, high IVT/VIM cation ratios, etc.) found in EMP analyses of garnierites. The small grain size, the high density of defects, and the structural arrangement actually intermediate between lizardite and chrysotile probably explain the ambiguities that occurred during the characterization with bulk techniques. The results obtained in this study may have important implications for ore processing methods.

Acknowledgments

Vittorio Mattioli is greatly acknowledged for providing the garnierite samples and Federico Caldiroli for their preliminary characterization during his graduate thesis. Paolo Gentile is greatly acknowledged for assistance during SEM observations and analyses; Lucia Galimberti for EDXRF and XRPD analyses of peridotite; Eleonora Braschi for EMP analyses on garnierite. The paper has greatly benefited from careful revision by two anonymous referees.

References cited

Back, W., Garrido, C.J., Paulick, H., Harvey, J., and Rosner, M. (2004) Seawater-peridotite interactions: First insights from ODP Leg 209, MAR 15 °N. Geochemistry, Geophysics, Geosystem, 5, 1–22.10.1029/2004GC000744Search in Google Scholar

Bailey, S.W. (1988) Introduction. In S.W. Bailey, Eds., Hydrous Phyllosilicates (Exclusive of micas), 19, p. 1–8. Reviews in Mineralogy, Mineralogical Society of America, Chantilly, Virginia.10.1515/9781501508998Search in Google Scholar

Balan, E., Saitta, A.M., Mauri, F., Lemaire, C., and Guyot, F. (2002) First-principles calculation of the infrared spectrum of lizardite. American Mineralogist, 87, 1286–1290.10.2138/am-2002-1003Search in Google Scholar

Baron, F., and Petit, S. (2016) Interpretation of the infrared spectra of the lizardite-nepouite series in the near- and mid-infrared range. American Mineralogist, 101, 423–430.10.2138/am-2016-5352Search in Google Scholar

Bertolani, M. (1968) La petrografia della Valle Strona (Alpi Occidentali Italiane). Schweizer Mineralogische und Petrographische Mitteilungen, 48, 3, 695–732.Search in Google Scholar

Bertolani, M. (1974) Guida geologico-petrografica della Valsesia-Valsessera e Valle Strona, 123 p. Associazione Pro Natura Valsesia, Varallo.Search in Google Scholar

Bish, D.L., and Post, J.E. (1993) Quantitative mineralogical analysis using the Rietveld full-pattern fitting method. American Mineralogist, 78, 932–940.Search in Google Scholar

Boriani, A., and Sacchi, R. (1973) Geology of the junction between the Ivrea-Verbano and the Strona-Ceneri zones. Memorie dell’Istituto di Geologia e Mineralogia dell’Università di Padova, 28, 1–36.Search in Google Scholar

Brand, N.W., Butt, C.R.M., and Elias, M. (1998) Nickel laterites: classification and features. AGSO Journal of Australian Geology and Geophysics, 17, 81–88.Search in Google Scholar

Bricker, O.P., Nesbitt, H.W., and Gunter, W.D. (1973) The stability of talc. American Mineralogist, 58, 64–72.Search in Google Scholar

Brigatti, M.F., Galli, E., Medici, L., and Poppi, L. (1997) Crystal structure refinement of aluminian lizardite-2H2. American Mineralogist, 82, 931–935.10.2138/am-1997-9-1010Search in Google Scholar

Brindley, G.W. (1980) The structure and chemistry of hydrous nickel-containing silicate and nickel-aluminium hydroxy minerals. Bullettin de Minéralogie, 103, 161–169.10.3406/bulmi.1980.7391Search in Google Scholar

Brindley, G.W., and Hang, P.T. (1973) The nature of garnierites—I: Structures, chemical compositions and color characteristics. Clays and Clay Minerals, 21, 27–40.10.1346/CCMN.1973.0210106Search in Google Scholar

Brindley, G.W., and Maksimović, Z. (1974) The nature and nomenclature of hydrous nickel-containing silicates. Clay Minerals, 10, 271–277.10.1180/claymin.1974.010.4.05Search in Google Scholar

Brindley, G.W., and Wan, H.M. (1975) Compositions, structures and thermal, behavior of nickel-containing minerals in lizardite-nepouite series. American Mineralogist, 60, 863–871.Search in Google Scholar

Buatier, M., Choulet, F., Petit, S., Chassagnon, R., and Vennemann, T. (2016) Nature and origin of natural Zn clay minerals from the Bou Arhous Zn ore deposit: Evidence from electron microscopy (SEM-TEM) and stable isotope compositions (H and O). Applied Clay Science, 132-133, 377–390.10.1016/j.clay.2016.07.004Search in Google Scholar

Butt, C.R.M., and Cluzel, D. (2013) Nickel laterite ore deposits: weathered serpentinites. Elements, 9, 123–128.10.2113/gselements.9.2.123Search in Google Scholar

Capitani, G.C., and Mellini, M. (2004) The modulated crystal structure of antigorite: the m = 17 polysome. American Mineralogist, 89, 147–158.10.2138/am-2004-0117Search in Google Scholar

Capitani, G.C., and Mellini, (2006) The crystal structure of the m = 16 antigorite polysome, by single crystal synchrotron diffraction. American Mineralogist, 91, 394–399.10.2138/am.2006.1919Search in Google Scholar

Capitani, G.C., and Mellini, (2007) High-resolution transmission electron microscopy (HRTEM) investigation of antigorite polysomes (m = 15 to 18). American Mineralogist, 92, 64–71.10.2138/am.2007.2188Search in Google Scholar

Capitani, G.C., Schingaro, E., Lacalamita, M., Mesto, E., and Scordari, F. (2016) 2M2-tobelite single crystals from Ordovician Armorican sandstones (western France): Structural anomalies explained by high resolution and analytical electron microscopy. Mineralogical Magazine, 80, 143–156.10.1180/minmag.2015.079.7.14Search in Google Scholar

Cavallo, A., and Rimoldi, B. (2013) Chrysotile asbestos in serpentinite quarries: a case study in Valmalenco, Central Alps, Northern Italy. Environmental Sciences: Processes and Impacts, 15, 1341–1350.10.1039/c3em00193hSearch in Google Scholar PubMed

Choulet, F., Buatier, M., Barbanson, L., Guégan, R., and Ennaciri, A. (2016) Zinc-rich clays in supergene non-sulfide zinc deposits. Mineralium Deposita, 51, 467–490.10.1007/s00126-015-0618-8Search in Google Scholar

Chukanov, N.V., and Chervonnyi, A.D. (2016) Infrared Spectroscopy of Minerals and Related Compounds, 1109 p. Springer.10.1007/978-3-319-25349-7Search in Google Scholar

Esson, J., and Carlos, L. (1978) The occurrence, mineralogy and chemistry of some garnierites from Brazil. Bulletin du Bureau de Recherches Géologiques et Minières, section II, 3, 263–274.Search in Google Scholar

Farmer, V.C. (1974) The Infrared Spectra of Minerals, 539 p. The Mineralogical Society, London.10.1180/mono-4Search in Google Scholar

Faust, G.T. (1966) The hydrous nickel-magnesium silicates—The garnierite group. American Mineralogist, 51, 279–297.Search in Google Scholar

Faust, G.T., Fahey, J.J., Mason, B., and Dwornik, E.J. (1969) Pecoraite, Ni6Si4O10(OH)9, nickel analog of clinochrysotile, formed in the Wolf Creek meteorite. Science, 165, 59–60.10.1126/science.165.3888.59Search in Google Scholar PubMed

Fregola, R.A., Capitani, G.C., Scandale, E., and Ottolini, L. (2009) Chemical control on 3T stacking order in a Li-poor biotite mica. American Mineralogist, 94, 334–344.10.2138/am.2009.3004Search in Google Scholar

Fritsch, E., Juillot, F., Dublet, G., Fonteneau, L., Fandeur, D., Martin, E., Caner, L., Auzende, A.L., Grauby, O., and Beaufort, D. (2016) An alternative model for the formation of hydrous Mg/Ni layer silicates (“deweylite”/“garnierite”) in faulted peridotites of New Caledonia: I. Texture and mineralogy of a paragenetic succession of silicate infillings. European Journal of Mineralogy, 28, 295–311.10.1127/ejm/2015/0027-2503Search in Google Scholar

Frost, R.L., Reddy, B.J., and Dickfos, M.J. (2008) Raman spectroscopy of the nickel silicate mineral pecoraite—an anologue of chrysotile (asbestos). Journal of Raman Spectroscopy, 39, 909–913.10.1002/jrs.1933Search in Google Scholar

Galí, S., Soler, J.M., Proenza, J.A., Lewis, J.F., Cama, J., and Tauler, E. (2012) Ni enrichment and stability of Al-free garnierite solid-solutions: A thermodynamic approach. Clays and Caly Minerals, 60, 121–135.10.1346/CCMN.2012.0600203Search in Google Scholar

Hill, R.J. (1991) Expanded use of the Rietveld method in studies of phase abundance in multiphase mixtures. Powder Diffraction, 6, 74–77.10.1017/S0885715600017036Search in Google Scholar

Kerrick, D. (2002) Serpentinite seduction. Science, 298, 1344–1345.10.1126/science.298.5597.1344Search in Google Scholar PubMed

Kesler, E.K., and Simon, A.C. (2015) Mineral Resources, Economics and the Environment, 434 p. Cambridge University Press.10.1017/CBO9781139871426Search in Google Scholar

Kilaas, R. (1998) Optimal and near-optimal filters in high-resolution electron microscopy. Journal of Microscopy, 190, 45–51.10.1046/j.1365-2818.1998.3070861.xSearch in Google Scholar

Kim, D.-J., and Chung, H.-S. (2002) Effect of grinding on the structure and chemical extraction of metals from serpentine. Particulate Science and Technology, 20, 159–168.10.1080/02726350215336Search in Google Scholar

Kloprogge, J.T., Ruan, H., and Frost, R.L. (2000) Near-infrared spectroscopic study of synthetic and natural pyrophyllite. Neues Jahrbuch für Mineralogie-Monatshefte, 8, 337–347.Search in Google Scholar

Kogure, T. (2002) Investigations of micas using advanced transmission electron microscopy. In A. Mottana, F.P. Sassi, J.B. Thompson Jr., and S. Guggenheim, Eds., Micas: Crystal Chemistry and Metamorphic Petrology, 46, p. 281–312. Reviews in Mineralogy and Geochemistry, Mineralogical Society of America, Chantilly, Virginia.10.1515/9781501509070-010Search in Google Scholar

Larson, A.C., and Von Dreele, R.B. (2004) General Structure Analysis System (GSAS). Los Alamos National Laboratory Report LAUR 86-748.Search in Google Scholar

McDonald, R.G., and Whittington, B.I. (2008) Atmospheric acid leaching of nickel laterites review. Part I. Sulphuric acid technologies. Hydrometallurgy, 91, 35–55.10.1016/j.hydromet.2007.11.009Search in Google Scholar

Mellini, M. (1982) The crystal structure of lizardite 1T: hydrogen bonds and polytypism. American Mineralogist, 67, 587–598.Search in Google Scholar

Mellini, M., and Zanazzi, P.F. (1987) Crystal structure of lizardite-1T and lizardite-2H1 from Coli, Italy. American Mineralogist, 72, 943–948.Search in Google Scholar

Mével, C. (2003) Serpentinization of abyssal peridotites at mid-ocean ridges. Comptes Rendus Geoscience, 335, 825–852.10.1016/j.crte.2003.08.006Search in Google Scholar

Milton, C., Dwornik, E.J., and Finkelman, R.B. (1983) Pecoraite, the nickel analogue of chrysotile, Ni3Si2O5(OH)4 from Missouri. Neues Jahrbuch für Mineralogie Monatshefte, 11, 513–523.Search in Google Scholar

Mitchell, D.R. (2007) HRTEM filter. DigitalMicrograph Scripting, http://www.dmscripting.com/hrtem_filter.html(accessed September 22, 2017).Search in Google Scholar

Mugnaioli, E., Logar, M., Mellini, M., and Viti, C. (2007) Complexity in 15- and 30-sectors polygonal serpentine: Longitudinal sections, intrasector stacking faults and XRPD satellites. American Mineralogist, 92, 603–616.10.2138/am.2007.2272Search in Google Scholar

Pecora, W.T., Hobbs, S.W., and Murata, J.K. (1949) Variations in garnierite from the nickel deposit near Riddle, Oregon. Economic Geology, 44, 13–23.10.2113/gsecongeo.44.1.13Search in Google Scholar

Pelletier, B. (1983) Localization du nickel dans les minerais “garnieritiques” de Nouvelle-Calédonie. Sciences Géologique: Mémoire, 73, 173–183.Search in Google Scholar

Pelletier, B. (1996) Serpentines in nickel silicate ore from New Caledonia. Australasian Institute of Mining and Metallurgy publication series—Nickel conference “Mineral to Market,” Kalgoorlie. Western Australia, 6(96), 197–205.Search in Google Scholar

Perbost, R., Amouric, M., and Olives, J. (2003) Influence of cation size on the curvature of serpentine minerals: HRTEM-AEM study and elastic theory. Clays and Clay Minerals, 51, 430–438.10.1346/CCMN.2003.0510409Search in Google Scholar

Pichou, J.L., and Pichoir, F. (1984) A new model for quantitative X-ray microanalysis. Part I: application to the analysis of homogeneous samples. La Recherche Aerospatiale, 3, 13–38.Search in Google Scholar

Poncelet, G., Jacobs, P., Delannay, F., Genet, M., Gerard, P., and Herbillon, A. (1979) Étude préliminaire sur la localisation du nickel dans une garniérite naturelle. Bulletin de Minéralogie, 102, 379–385.10.3406/bulmi.1979.7333Search in Google Scholar

Reed, S.J.B. (2005) Electron Microprobe Analysis and Scanning Electron Microscopy in Geology, 189 p. Cambridge University Press.10.1017/CBO9780511610561Search in Google Scholar

Reynolds, R.C. (1968) The effect of particle size on apparent lattice spacings. Acta Crystallographica, A24, 319–320.10.1107/S0567739468000549Search in Google Scholar

Ridley, J. (2013) Ore Deposit Geology, 398 p. Cambridge University Press.10.1017/CBO9781139135528Search in Google Scholar

Roy, D.M., and Roy, R. (1954) An experimental study of the formation and properties of synthetic serpentine and related layer silicate minerals. American Mineralogist, 39, 957–975.Search in Google Scholar

Sanchez, E.C., Saito, F., and Horita, H. (1997) Enhancement of magnesium and nickel extraction from garnierite by mechanochemical treatment. Shigen-to-Sozai, 113, 35–38.10.2473/shigentosozai.113.35Search in Google Scholar

Schwertmann, U. (1991) Solubility and dissolution of iron oxides. Plant and Soil, 130, 1–25.10.1007/978-94-011-3294-7_1Search in Google Scholar

Shannon, R.D. (1976) Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides. Acta Crystallographica, A32, 751–767.10.1107/S0567739476001551Search in Google Scholar

Soler, J.M., Cama, J., Galí, S., Meléndez, W., Ramírez, A., and Estanga, J. (2008) Composition and dissolution kinetics of garnierite from the Loma de Hierro Ni-laterite deposit, Venezuela. Chemical Geology, 249, 191–202.10.1016/j.chemgeo.2007.12.012Search in Google Scholar

Song, Y., Moon, H.S., and Chon, H.T. (1995) New occurrence and characterization of Ni-serpentines in the Kwangcheon area, Korea. Clay Minerals, 30, 211–224.10.1180/claymin.1995.030.3.05Search in Google Scholar

Springer, G. (1974) Compositional and structural variations in garnierites. Canadian Mineralogist, 12, 381–388.Search in Google Scholar

Suárez, S., Nieto, F., Velasco, F., and Martín, F.J. (2011) Serpentine and chlorite as effective Ni-Cu sinks during weathering of the Aguablanca sulphide deposit (SW Spain). TEM evidence for metal-retention mechanisms in sheet silicates. European Journal of Mineralogy, 23, 179–196.10.1127/0935-1221/2011/0023-2084Search in Google Scholar

Van Cappellen, E., and Doukhan, J.C. (1994) Quantitative transmission X-ray micro-analysis of ionic compounds. Ultramicroscopy, 53, 343–349.10.1016/0304-3991(94)90047-7Search in Google Scholar

Villanova-de-Benavent, C., Proenza, J.A., Galí, S., García-Casco, A., Tauler, E., Lewis, J.F., and Longo, F. (2014) Garnierites and garnierites: Texture, mineralogy and geochemistry of garnierites in the Falcondo Ni-laterite deposit, Dominican Republic. Ore Geology Reviews, 58, 91–109.10.1016/j.oregeorev.2013.10.008Search in Google Scholar

Villanova-de-Benavent, C., Nieto, F., Viti, C., Proenza, J.A., Galí, S., and Roqué-Rosell, J. (2016) Ni-phyllosilicates (garnierites) from the Falcondo Ni-laterite deposit (Dominican Republic): Mineralogy, nanotextures and formation mechanism by HRTEM and AEM. American Mineralogist, 101, 1460–1473.10.2138/am-2016-5518Search in Google Scholar

Viti, C., and Mellini, M. (1997) Contrasting chemical composition in associated lizardite and chrysotile in veins from Elba, Italy. European Journal of Mineralogy, 9, 585–596.10.1127/ejm/9/3/0585Search in Google Scholar

Wells, M.A., Ramanaidou, E.R., Verrall, M., and Tessarolo, C. (2009) Mineralogy and crystal chemistry of garnierites in the Goro lateritic nickel deposit, New Caledonia. European Journal of Mineralogy, 21, 467–483.10.1127/0935-1221/2009/0021-1910Search in Google Scholar

Zanoletti, E. (2007) Il patrimonio geologico della Valle Strona (VB): un’opportunità per il turismo. Atti del 3° Congresso di Geologia and Turismo, Bologna (Italy).Search in Google Scholar

Zhang, F., Chan, S.W., Spanier, J.E., Apak, E., Jin, Q., Robinson, R.D., and Herman, I.P. (2002) Cerium oxide nanoparticles: size-selective formation and structure analysis. Applied Physics Letters, 80, 127–129.10.1063/1.1430502Search in Google Scholar

Zucchetti, S. (1979) Remarks on the nickel deposits of the Western Alps (Italy). Proceedings of the 3rd International Symposium on the Mineral Deposits of the Alps (ISMIDA), Loeben 1977, p. 355–360. Verhandlungen der Geologischen Bundesanstalt, 3, 529–534.Search in Google Scholar

Received: 2017-6-30
Accepted: 2017-12-18
Published Online: 2018-3-31
Published in Print: 2018-4-25

© 2018 Walter de Gruyter GmbH, Berlin/Boston

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