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Licensed Unlicensed Requires Authentication Published by De Gruyter September 28, 2018

Comparison of Rietveld-compatible structureless fitting analysis methods for accurate quantification of carbon dioxide fixation in ultramafic mine tailings

  • Connor C. Turvey EMAIL logo , Jessica L. Hamilton and Siobhan A. Wilson
From the journal American Mineralogist


The carbonation of ultramafic rocks, including tailings from ultramafic-hosted ore deposits, can be used to remove CO2 from the atmosphere and store it safely within minerals over geologic timescales. Quantitative X-ray diffraction (XRD) using Rietveld refinements can be employed to estimate the amount of carbon sequestered by carbonate minerals that form as a result of weathering of ultramafic rocks. However, the presence of structurally disordered phases such as serpentine minerals, which are common in ultramafic ore bodies such as at the Woodsreef chrysotile mine (New South Wales, Australia), results in samples that cannot be analyzed using typical Rietveld refinement strategies. Previous investigations of carbon sequestration at Woodsreef and other ultramafic mine sites typically used modified Rietveld refinement methods that apply structureless pattern fitting for disordered phases; however, no detailed comparison of the accuracy (or precision) of these methods for carbon accounting has yet been attempted, making it difficult to determine the most appropriate analysis method. Such an analysis would need to test whether some methods more accurately quantify the abundances of certain minerals, such as pyroaurite [Mg6Fe23+ (CO3)(OH)16·4H2O] and other hydrotalcite group minerals, which suffer from severe preferred orientation and may play an important role in carbon sequestration at some mines. Here, we assess and compare the accuracy, and to a lesser extent the precision, of three different non-traditional Rietveld refinement methods for carbon accounting: (1) the PONKCS method, (2) the combined use of a Pawley fit for serpentine minerals and an internal standard (Pawley/internal standard method), and (3) the combined use of PONKCS and Pawley/internal standard methods. We examine which of these approaches represents the most accurate way to quantify the abundances of serpentine, pyroaurite, and other carbonate-bearing phases in a given sample. We demonstrate that by combining the PONKCS and Pawley/internal standard methods it is possible to quantify the abundances of disordered phases in a sample and to obtain an estimate of the amorphous content and any unaccounted intensity in an XRD pattern. Eight artificial tailings samples with known mineralogical compositions were prepared to reflect the natural variation found within the tailings at the Woodsreef chrysotile mine. Rietveld refinement results for the three methods were compared with the known compositions of each sample to calculate absolute and relative error values and to evaluate the accuracy of the three methods, including whether they produce systematic under- or overestimates of mineral abundance. Estimated standard deviations were also calculated during refinements; these values, which are a measure of precision, were not strongly affected by the choice of refinement method. The abundance of serpentine minerals is, however, systematically overestimated when using the PONKCS and Pawley/internal standard methods, and the abundances of minor phases (<10 wt%) are systematically underestimated using all three methods. Refined abundances for pyroaurite were found to be increasingly susceptible to error with increasing abundance, with an underestimation of 6.6 wt% absolute (60.6% relative) for a sample containing 10.9 wt% pyroaurite. These significant errors are due to difficulties in mitigating preferred orientation of hydrotalcite minerals during sample preparation as well as modeling its effects on XRD patterns. The abundances of hydromagnesite [Mg5(CO3)4(OH)2·4H2O], another important host for atmospheric CO2 during weathering of ultramafic rocks, was consistently underestimated by all three methods, with the highest underestimation being 3.7 wt% absolute (or 25.0% relative) for a sample containing 15.0 wt% hydromagnesite. Overall, the Pawley/internal standard method produced more accurate results than the PONKCS method, with an average bias per refinement of 6.7 wt%, compared with 10.3 wt% using PONKCS and 12.9 wt% for the combined PONKCS-Pawley/internal standard method. Furthermore, the values for the refined abundance of hydromagnesite obtained from refinements using the Pawley/internal standard method were significantly more accurate than those for refinements done with the PONKCS method, with relative errors typically <25% for hydromagnesite abundances between 5 and 15 wt%. The simpler and faster sample preparation makes the PONKCS method well-suited for rapid carbon accounting, for instance in the field using a portable XRD; however, the superior accuracy gained when using an internal standard make the Pawley/internal standard method the preferable means of undertaking a detailed laboratory-based study. As all three methods displayed an underestimation of carbonate phases, applying these methods to natural samples will likely produce an underestimate of hydromagnesite and hydrotalcite group mineral abundances. As such, crystallographic accounting strategies that use modified Rietveld refinement methods produce a conservative estimate of the carbon sequestered in minerals.


We thank Jenine McCutcheon and Gordon Southam for their invaluable assistance in the field. We acknowledge the financial assistance of Carbon Management Canada and the New South Wales Department of Industry. We also thank Kate Maddison, Nick Staheyeff, Catherine Karpiel, and Brad Mullard at the New South Wales Department of Industry for granting us access to the field site and for their support of our work at Woodsreef. We thank Ben Grguric for providing a sample of iowaite from the Mount Keith nickel mine. Work by C.C. Turvey and J.L. Hamilton was supported by Australian Postgraduate Awards. We are grateful to David Bish and an anonymous reviewer for their constructive advice that has helped us to improve our work. Our thanks go to Warren Huff for editorial handling of this manuscript.

References cited

Akao, M., and Iwai, S. (1977) The hydrogen bonding of hydromagnesite. Acta Crystallographica, B33, 1273–1275.10.1107/S0567740877005834Search in Google Scholar

Alexander, L., and Klug, H.P. (1948) Basic aspects of X-ray absorption in quantitative diffraction analysis of powder mixtures. Analytical Chemistry, 20, 886–889.10.1021/ac60022a002Search in Google Scholar

Assima, P.G., Larachi, F., Beaudoin, G., and Molson, J. (2012) CO2 sequestration in chrysotile mining residues—Implication of watering and passivation under environmental conditions. Industrial & Engineering Chemistry Research, 51, 8726–8734.10.1021/ie202693qSearch in Google Scholar

Assima, P.G., Larachi, F., Beaudoin, G., and Molson, (2013a) Dynamics of carbon dioxide uptake in chrysotile mining residues—Effect of mineralogy and liquid saturation. International Journal of Greenhouse Gas Control, 12, 124–135.10.1016/j.ijggc.2012.10.001Search in Google Scholar

Assima, G.P., Larachi, F., Molson, J., and Beaudoin, G. (2013b) Accurate and direct quantification of native brucite in serpentine ores—New methodology and implications for CO2 sequestration by mining residues. Thermochimica Acta, 566, 281–291.10.1016/j.tca.2013.06.006Search in Google Scholar

Assima, G.P., Larachi, F., Molson, J., and Beaudoin, G. (2014a) Emulation of ambient carbon dioxide diffusion and carbonation within nickel mining residues. Minerals Engineering, 59, 39–44.10.1016/j.mineng.2013.09.002Search in Google Scholar

Assima, G.P., Larachi, F., Molson, J., and Beaudoin, G. (2014b) New tools for stimulating dissolution and carbonation of ultramafic mining residues. The Canadian Journal of Chemical Engineering, 92, 2029–2038.10.1002/cjce.22066Search in Google Scholar

Bea, S.A., Wilson, S.A., Mayer, K.U., Dipple, G.M., Power, I.M., and Gamazo, P. (2012) Reactive transport modeling of natural carbon sequestration in ultramafic mine tailings. Vadose Zone Journal, 11(2), 18 p. 10.2136/vzj2011.0053.Search in Google Scholar

Beaudoin, G., Nowamooz, A., Assima, G.P., Lechat, K., Gras, A., Entezari, A., Kandji, E.H.B., Awoh, A.-S., Horswill, M., Turcotte, S., and others. (2017) Passive mineral carbonation of Mg-rich mine wastes by atmospheric CO2. Energy Procedia, 114, 6083–6086.10.1016/j.egypro.2017.03.1745Search in Google Scholar

Beinlich, A., and Austrheim, H. (2012) In situ sequestration of atmospheric CO2 at low temperature and surface cracking of serpentinized peridotite in mine shafts. Chemical Geology, 332-333, 32–44.10.1016/j.chemgeo.2012.09.015Search in Google Scholar

Berner, R.A. (1990) Atmospheric carbon dioxide levels over phanerozoic time. Science, 249, 1382–1386.10.1126/science.249.4975.1382Search in Google Scholar PubMed

Bish, D.L. (1980) Anion-exchange in takovite: Applications to other hydrotalcite minerals. Bulletin Mineralogie, 103, 170–175.10.3406/bulmi.1980.7392Search in Google Scholar

Bish, D.L., and Howard, S.A. (1988) Quantitative phase analysis using the Rietveld method. Journal of Applied Crystallography, 21(2), 86–91.10.1107/S0021889887009415Search in Google Scholar

Bobicki, E.R., Liu, Q., Xu, Z., and Zeng, H. (2012) Carbon capture and storage using alkaline industrial wastes. Progress in Energy and Combustion Science, 38(2), 302–320.10.1016/j.pecs.2011.11.002Search in Google Scholar

Brindley, G.W. (1945) XLV. The effect of grain or particle size on X-ray reflections from mixed powders and alloys, considered in relation to the quantitative determination of crystalline substances by X-ray methods. Philosophical Magazine Series, 7, 36, 347–369.10.1080/14786444508520918Search in Google Scholar

Catti, M., Ferraris, G., Hull, S., and Pavese, A. (1995) Static compression and H disorder in brucite, Mg(OH)2, to 11 GPa: a powder neutron diffraction study. Physics and Chemistry of Minerals, 22, 200–206.10.1007/BF00202300Search in Google Scholar

Chang, E.E., Chen, C.H., Chen, Y.H., Pan, S.Y., and Chiang, P.C. (2011) Performance evaluation for carbonation of steel-making slags in a slurry reactor. Journal of Hazardous Materal, 186(1), 558–564.10.1016/j.jhazmat.2010.11.038Search in Google Scholar PubMed

Cheary, R.W., and Coelho, A. (1992) A fundamental parameters approach to X-ray line-profile fitting. Journal of Applied Crystallography, 25(2), 109–121.10.1107/S0021889891010804Search in Google Scholar

Chung, F.H. (1974) Quantitative interpretation of X-ray diffraction patterns of mixtures 1. Matrix-flushing method for quantitative multicomponent analysis. Journal of Applied Crystallography, 7(6).10.1107/S0021889874010375Search in Google Scholar

Cleugh, H., Smith, M.S., Battaglia, M., and Graham, P. (2011) Climate change science and solutions for Australia. CSIRO Publishing, Collingwood, Australia.Search in Google Scholar

Dipple, G.M., Raudsepp, M., and Gordon, T.M. (2002) Assaying wollastonite in skarn. In Industrial Minerals in Canada, special vol. 53, p. 303–312. Canadian Istitute of Mining Metallurgy and Petroleum.Search in Google Scholar

Dollase, W. (1986) Correction of intensities for preferred orientation in powder diffractometry: Application of the March model. Journal of Applied Crystallography, 19(4), 267–272.10.1107/S0021889886089458Search in Google Scholar

Falini, G., Foresti, E., Gazzano, M., Gualtieri, A.F., Leoni, M., Lesci, I.G., and Roveri, N. (2004) Tubular-shaped stoichiometric chrysotile nanocrystals. Chemistry, 10(12), 3043–3049.10.1002/chem.200305685Search in Google Scholar PubMed

Gualtieri, A.F. (2000) Accuracy of XRPD QPA using the combined Rietveld-RIR method. Journal of Applied Crystallography, 33(2), 267–278.10.1107/S002188989901643XSearch in Google Scholar

Hamilton, J.L., Wilson, S.A., Morgan, B., Turvey, C.C., Paterson, D.J., MacRae, C., McCutcheon, J., and Southam, G. (2016) Nesquehonite sequesters transition metals and CO2 during accelerated carbon mineralisation. International Journal of Greenhouse Gas Control, 55, 73–81.10.1016/j.ijggc.2016.11.006Search in Google Scholar

Hamilton, J.L., Wilson, S.A., Morgan, B., Turvey, C.C., Paterson, D.J., Jowitt, S., McCutcheon, J., and Southam, C. (2018) Fate of transition metals during passive carbonation of ultramafic mine tailings via air capture with potentials for metal resource recovery. International Journal of Greenhouse Gas Control, 71, 155–167.10.1016/j.ijggc.2018.02.008Search in Google Scholar

Harrison, A.L., Power, I.M., and Dipple, G.M. (2013) Accelerated carbonation of brucite in mine tailings for carbon sequestration. Environmental Science and Technology, 47(1), 126–134.10.1021/es3012854Search in Google Scholar PubMed

Harrison, A.L., Dipple, G.M., Power, I.M., and Mayer, K.U. (2015) Influence of surface passivation and water content on mineral reactions in unsaturated porous media: Implications for brucite carbonation and CO2 sequestration. Geochimica et Cosmochimica Acta, 148, 477–495.10.1016/j.gca.2014.10.020Search in Google Scholar

Hill, R.J., and Howard, C.J. (1987) Quantitative phase analysis from neutron powder diffraction data using the Rietveld method. Journal of Applied Crystallography, 20(6), 467–474.10.1107/S0021889887086199Search in Google Scholar

Hillier, S. (1999) Use of an air brush to spray dry samples for X-ray powder diffraction. Clay Minerals, 34, 127–135.10.1180/000985599545984Search in Google Scholar

Hitch, M., Ballantyne, S.M., and Hindle, S.R. (2010) Revaluing mine waste rock for carbon capture and storage. International Journal of Mining, Reclamation and Environment, 24(1), 64–79.10.1080/17480930902843102Search in Google Scholar

Houghton, J.T., Ding, Y., Griggs, D.J., Noguer, M., van der Linden, P.J., Dai, X., Maskell, K., and Johnson, C.A. (2001) Climate Change 2001: The scientific basis: Contribution of Working Group 1 to the third assessment report of the Intergovernmental Panel on Climate Change. Cambridge University Press, U.K.Search in Google Scholar

IPCC (2005) IPCC special report on carbon dioxide capture and storage. In O.D.B. Metz, H. de Coninck, M. Loos, and L. Meyer, Ed., Carbon Capture And Storage, p. 442. Cambridge University Press.Search in Google Scholar

IPCC (2013) Climate Change 2013: The physical science basis. In IPCC, Ed., IPCC Working Group 1. Cambridge University Press, New York.Search in Google Scholar

IPCC (2014) Climate Change 2014: Mitigation of climate change. In IPCC, Ed., IPCC Working Group 3. Cambridge University Press, New York.Search in Google Scholar

Kump, L.R., Brantley, S.L., and Arthur, M.A. (2000) Chemical weathering, atmospheric CO2 and climate. Annual Review of Earth and Planetary Sciences, 28, 611–667.10.1146/ in Google Scholar

Lackner, K.S. (2002) Carbonate chemistry for sequestering fossil carbon. Annual Review of Energy and the Environment, 27(1), 193–232.10.1146/ in Google Scholar

Lackner, K.S. (2003) A guide to CO2 sequestration. Science, 300, 1677–1678.10.1126/science.1079033Search in Google Scholar

Lackner, K.S., Wendt, C.H., Butt, D.P., Joyce, E.L. Jr., and Sharp, D.H. (1995) Carbon dioxide disposal in carbonate minerals. Energy, 20(11), 1153–1170.10.1016/0360-5442(95)00071-NSearch in Google Scholar

Laughton, C.A., and Green, N. (2002) Woodsreef magnesium project: An example of sustainable mineral waste processing from mined ore and its utilisation to produce refined metal products. Green Processing 2002. New South Wales Department of Mineral Resources, Australia.Search in Google Scholar

Lechat, K., Lemieux, J.M., Molson, J.W., Beaudoin, G., and Hebert, R. (2016) Field evidence of CO2 sequestration by mineral carbonation in ultramafic milling wastes, Thetford Mines, Canada. International Journal of Greenhouse Gas Control, 47, 110–121.10.1016/j.ijggc.2016.01.036Search in Google Scholar

Leung, D.Y.C., Caramanna, G., and Maroto-Valer, M.M. (2014) An overview of current status of carbon dioxide capture and storage technologies. Renewable and Sustainable Energy Reviews, 39, 426–443.10.1016/j.rser.2014.07.093Search in Google Scholar

Leventouri, T. (1997) A new method for measuring the degree of preferred orientation in bulk textured YBa2Cu3Ox. Physica C: Superconductivity, 277(1–2), 82–86.10.1016/S0921-4534(97)00063-4Search in Google Scholar

March, A. (1932) Mathematische theorie der regelung nach der korn gestalt bei affiner deformation. Zeitschrift für Kristallographie, 81, 285–297.10.1524/zkri.1932.81.1.285Search in Google Scholar

McCutcheon, J., Dipple, G.M., Wilson, S.A., and Southam, G. (2015) Production of magnesium-rich solutions by acid leaching of chrysotile: A precursor to field-scale deployment of microbially enabled carbonate mineral precipitation. Chemical Geology, 413, 119–131.10.1016/j.chemgeo.2015.08.023Search in Google Scholar

McCutcheon, J., Wilson, S.A., and Southam, G. (2016) Microbially accelerated carbonate mineral precipitation as a strategy for in situ carbon sequestration and rehabilitation of asbestos mine sites. Environmental Science & Technology, 50(3), 1419–1427.10.1021/acs.est.5b04293Search in Google Scholar PubMed

McCutcheon, J., Turvey, C.C., Wilson, S.A., Hamilton, J.L., and Southam, G. (2017) Mine site deployment of microbial carbonation for the stabilization of asbestos mine tailings. Minerals, 7(10), 191.10.3390/min7100191Search in Google Scholar

Mellini, M., and Viti, C. (1994) Crystal structure of lizardite-1T from Elba, Italy. American Mineralogist, 79, 1194–1198.Search in Google Scholar

Merril, R.J., Butt, B.C., Forrest, V.C., Purdon, G., and Bramley-Moore, R.A. (1980) Asbestos production at Chrysotile Corporation of Australia Pty. Limited, Barraba, N.S.W. In J.T. Woodcock, Ed., Mining and metallurgical practices in Australasia, 10, p. 669–673. The Australasian Institute of Mining and Metallurgy, Victoria, Australia.Search in Google Scholar

Mervine, E., Wilson, S.A., Power, I.M., Dipple, G.M., Turvey, C.C., Hamilton, J.L., Vanderzee, S., Raudsepp, M., Southam, C., Matter, J.M., Kelemen, P.B., Stiefenhofer, J., Miya, Z., and Southam, G. (2018) Carbon storage potential of kimberlite mine tailings. Mineralogy and Petrology, 1–11. in Google Scholar

Millar, R.J., Fuglestvedt, J.S., Friedlingstein, P., Rogelj, J., Grubb, M.J., Matthews, H.D., Skeie, R.B., Forster, P.M., Frame, D.J., and Allen, M.J. (2017) Emission budgets and pathways consistent with limiting warming to 1.5°C. Nature Geoscience, 10, 741–748.10.1038/ngeo3031Search in Google Scholar

Miyata, S. (1983) Anion-exchange properties of hydrotalcite-like compounds. Clays and Clay Minerals, 31(4), 305–311.10.1346/CCMN.1983.0310409Search in Google Scholar

Oelkers, E.H., Gislason, S.R., and Matter, J. (2008) Mineral carbonation of CO2. Elements, 4, 333–337.10.2113/gselements.4.5.333Search in Google Scholar

Olowe, A. (1995) Crystal structures of pyroaurite and sjoegrenite. Advances in X-ray Analysis, 38, 749–755.10.1154/S0376030800018498Search in Google Scholar

Omotoso, O., McCarty, D.K., Hillier, S., and Kleeberg, R. (2006) Some successful approaches to quantitative mineral analysis as revealed by the 3rd Reynolds Cup contest. Clays and Clay Minerals, 54(6), 748–760.10.1346/CCMN.2006.0540609Search in Google Scholar

Oskierski, H.C., Dlugogorski, B.Z., and Jacobsen, G. (2013) Sequestration of atmospheric CO2 in chrysotile mine tailings of the Woodsreef asbestos mine, Australia: Quantitative mineralogy, isotopic fingerprinting and carbonation rates. Chemical Geology, 358, 156–169.10.1016/j.chemgeo.2013.09.001Search in Google Scholar

Pacala, S., and Socolow, R. (2004) Stabilization wedges: Solving the climate problem for the next 50 years with current technologies. Science, 305, 968–972.10.1126/science.1100103Search in Google Scholar PubMed

Pawley, G. (1981) Unit-cell refinement from powder diffraction scans. Journal of Applied Crystallography, 14(6), 357–361.10.1107/S0021889881009618Search in Google Scholar

Pederson, B.M., Schaible, K.J., and Winburn, R.S. (2004) Minimization of errors due to microabsorption or absorption contrast. Advances in X-ray Analysis, 47, 200–205.Search in Google Scholar

Power, I.M., Harrison, A.L., Dipple, G.M., Wilson, S.A., Kelemen, P.B., Hitch, M., and Southam, G. (2013a) Carbon mineralization: From natural analogues to engineered systems. Reviews in Mineralogy and Geochemistry, 77, 305–360.10.1515/9781501508073-011Search in Google Scholar

Power, I.M., Wilson, S.A., and Dipple, G.M. (2013b) Serpentinite carbonation for CO2 sequestration. Elements, 9, 115–121.10.2113/gselements.9.2.115Search in Google Scholar

Power, I.M., Wilson, S.A., Harrison, A.L., Dipple, G.M., McCutcheon, J., Southam, G., and Kenward, P.A. (2014) A depositional model for hydromagnesite–magnesite playas near Atlin, British Columbia, Canada. Sedimentology, 61(6), 1701–1733.10.1111/sed.12124Search in Google Scholar

Pronost, J., Beaudoin, G., Tremblay, J., Larachi, F., Duchesne, J., Hebert, R., and Constantin, M. (2011) Carbon sequestration kinetic and storage capacity of ultramafic mining waste. Environmental Science & Technology, 45(21), 9413–9420.10.1021/es203063aSearch in Google Scholar PubMed

Pronost, J., Beaudoin, G., Lemieux, J.M., Hebert, R., Constantin, M., Marcouiller, S., Klein, M., Duchesne, J., Molson, J.W., Larachi, F., and Maldague, X. (2012) CO2-depleted warm air venting from chrysotile milling waste (Thetford Mines, Canada): Evidence for in-situ carbon capture from the atmosphere. Geology, 40(3), 275–278.10.1130/G32583.1Search in Google Scholar

Raudsepp, M., Pani, E., and Dipple, G.M. (1999) Measuring mineral abundance in skarn. I. The Rietveld method using X-ray powder-diffraction data. Canadian Mineralogist, 13, p. 1–15.Search in Google Scholar

Rietveld, H. (1969) A profile refinement method for nuclear and magnetic structures. Journal of Applied Crystallography, 2(2), 65–71.10.1107/S0021889869006558Search in Google Scholar

Rinaudo, C., Gastaldi, D., and Bulluso, E. (2003) Characterization of chrysotile, antigorite and lizardite by FT-Raman spectroscopy. Canadian Mineralogist, 41, 883–890.10.2113/gscanmin.41.4.883Search in Google Scholar

Scarlett, N.V.Y., and Madsen, I.C. (2006) Quantification of phases with partial or no known crystal structures. Powder Diffraction, 21(4), 278–284.10.1154/1.2362855Search in Google Scholar

Scarlett, N.V.Y., Madsen, I.C., Cranswick, L.M.D., Lwin, T., Groleau, E., Stephenson, G., Aylmore, M., and Agron-Olshina, N. (2002) Outcomes of the International Union of Crystallography Commission on Powder Diffraction Round Robin on Quantitative Phase Analysis: samples 2, 3, 4, synthetic bauxite, natural granodiorite and pharmaceuticals. Journal of Applied Crystallography, 35, 383–400.10.1107/S0021889802008798Search in Google Scholar

Seifritz, W. (1990) CO2 disposal by means of silicates. Nature, 345.10.1038/345486b0Search in Google Scholar

Stephens, P.W. (1999) Phenomenological model of anisotropic peak broadening in powder diffraction. Journal of Applied Crystallography, 32, 281–289.10.1107/S0021889898006001Search in Google Scholar

Tsukimura, K., Sasaki, S., and Kimizuka, N. (1997) Cation distributions in nickel ferrites. Japanese Journal of Applied Physics, 36(6R), 3609.10.1143/JJAP.36.3609Search in Google Scholar

Turvey, C.C., Wilson, S.A., Hamilton, J.L., and Southam, G. (2017) Field-based accounting of CO2 sequestration in ultramafic mine wastes using portable X-ray diffraction. American Mineralogist, 102, 1302–1310.10.2138/am-2017-5953Search in Google Scholar

Von Dreele, R.B. (1997) Quantitative texture analysis by Rietveld refinement. Journal of Applied Crystallography, 30(4), 517–525.10.1107/S0021889897005918Search in Google Scholar

Whitfield, P.S. (2008) Spherical harmonics preferential orientation corrections and structure solution from powder diffraction data—a possible avenue of last resort. Journal of Applied Crystallography, 42, 134–136.10.1107/S0021889808041149Search in Google Scholar

Wicks, F.J. (2000) Status of the reference X-ray powder-diffraction patterns for the serpentine minerals in the PDF database—1997. Powder Diffraction, 15, 42–50.10.1017/S0885715600010824Search in Google Scholar

Wicks, F.J., and Whittaker, E.J.W. (1975) A reappraisal of the structures of the serpentinte minerals. Canadian Mineralogist, 13, 227–243.Search in Google Scholar

Wilson, S.A., Raudsepp, M., and Dipple, G.M. (2006) Verifying and quantifying carbon fixation in minerals from serpentine-rich mine tailings using the Rietveld method with X-ray powder diffraction data. American Mineralogist, 91, 1331–1341.10.2138/am.2006.2058Search in Google Scholar

Wilson, S.A., Dipple, G.M., Power, I.M., Thom, J.M., Anderson, R.G., Raudsepp, M., Gabites, J.E., and Southham, G. (2009a) Carbon dioxide fixation within mine wastes of ultramafic-hosted ore deposits: Examples from the Clinton Creek and Cassiar chrysotile deposits, Canada. Economic Geology, 104, 95–112.10.2113/gsecongeo.104.1.95Search in Google Scholar

Wilson, S.A., Raudsepp, M., and Dipple, G.M. (2009b) Quantifying carbon fixation in trace minerals from processed kimberlite; a comparative study of quantitative methods using X-ray powder diffraction data with applications to the Diavik diamond mine, Northwest Territories, Canada. Applied Geochemistry, 24(12), 2312–2331.10.1016/j.apgeochem.2009.09.018Search in Google Scholar

Wilson, S.A., Barker, S.L.L., Dipple, G.M., and Atudorei, V. (2010) Isotopic disequilibrium during uptake of atmospheric CO2 into mine process waters: implications for CO2 sequestration. Environmental Science & Technology, 44, 9522–9529.10.1021/es1021125Search in Google Scholar PubMed

Wilson, S.A., Harrison, A.L., Dipple, G.M., Power, I.M., Barker, S.L.L., Mayer, K.U., Fallon, S.J., Raudsepp, M., and Southam, G. (2014) Offsetting of CO2 emissions by air capture in mine tailings at the Mount Keith Nickel mine, Western Australia: Rates, controls and propects for carbon neutral mining. International Journal of Greenhouse Gas Control, 25, 121–140.10.1016/j.ijggc.2014.04.002Search in Google Scholar

Received: 2018-02-20
Accepted: 2018-06-01
Published Online: 2018-09-28
Published in Print: 2018-10-25

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