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nepouite

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Journal Article

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, Gennaro Ventruti
Published: 01 April 2018
American Mineralogist (2018) 103 (4): 629–644.
DOI: https://doi.org/10.2138/am-2018-6229
... 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...
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Interpretation of the infrared spectra of the lizardite-nepouite series in the near- and mid-infrared range

Fabien Baron, Sabine Petit
Published: 01 February 2016
American Mineralogist (2016) 101 (2): 423–430.
DOI: https://doi.org/10.2138/am-2016-5352
...Fabien Baron; Sabine Petit Abstract A series of 1:1 silicate clays of the lizardite-nepouite series [Si 2 Mg 3−x Ni x O 5 (OH 4 ) with x = 0, 0.5, 1, 1.5, 2, 2.5, and 3] was synthesized at 220 °C during 7 days from coprecipitated gels in hydrothermal conditions. A clear relationship was evidenced...
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Compositions, structures, and thermal behavior of nickel-containing minerals in the lizardite-nepouite series

G. W. Brindley, Hsien-Ming Wan
Published: 01 October 1975
American Mineralogist (1975) 60 (9-10): 863–871.
... unit R 3 Si 2 O 5 (OH) 4 are called nepouites, and those with fewer Ni ions are called nickel lizardites. The samples vary considerably in structural order and the nepouites generally are less well-ordered than the nickel lizardites. Among the latter, two show clear evidence for a 2-layer orthogonal...
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NIR spectra in the combination region and their second derivative of lizard...

NIR spectra in the combination region and their second derivative of lizard...

Published: 01 February 2016
Figure 7 NIR spectra in the combination region and their second derivative of lizardite (x = 0) [Si 2 Mg 3 O 5 (OH) 4 ] ( a ), and nepouite (x = 3) [Si 2 Ni 3 O 5 (OH) 4 ] ( b ). Numbers 1 to 21 correspond to combination bands listed in Table 1 for lizardite (x = 0) and in Table 2
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Lippmann diagrams for solid solutions: (a) serpentine-<span class="search-highlight">népouite</span>, (b) kerolit...

Lippmann diagrams for solid solutions: (a) serpentine-népouite, (b) kerolit...

Published: 01 April 2012
Figure 2. Lippmann diagrams for solid solutions: (a) serpentine-népouite, (b) kerolite-pimelite, and (c) sepiolite-falcondoite. Diagrams show solidus, minimum stoichiometric saturation (MSS), and solutus curves (continuous lines). Dotted curves give the log ∑Π values corresponding to the two
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(A) EDS spectrum of <span class="search-highlight">népouite</span> [(Ni,Mg) 3 Si 2 O 5 (OH) 4 ] prepared by crush...

(A) EDS spectrum of népouite [(Ni,Mg) 3 Si 2 O 5 (OH) 4 ] prepared by crush...

Published: 01 September 2019
Fig. 9 (A) EDS spectrum of népouite [(Ni,Mg) 3 Si 2 O 5 (OH) 4 ] prepared by crushing and deposited on C-film supported by an Au-grid. Note the Au lines coming from the grid and the K α-lines of Co and Fe. Co and Fe can actually enter the népouite structure substituting for Ni and Mg
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( a ) Low-magnification TEM image of <span class="search-highlight">népouite</span>; ( b ) lattice fringe image o...

( a ) Low-magnification TEM image of népouite; ( b ) lattice fringe image o...

Published: 01 April 2018
Figure 9. ( a ) Low-magnification TEM image of népouite; ( b ) lattice fringe image of the same area showing nanoflakes with one-layer periodicity. Note the close resemblance of a to Figure 5 c of Villanova-de-Benavent et al. (2016) , although they refer to two different phases, namely a 7
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HR image simulation along 〈110〉 of three <span class="search-highlight">népouite</span> polytypes derived from th...

HR image simulation along 〈110〉 of three népouite polytypes derived from th...

Published: 01 April 2018
Figure 10. HR image simulation along 〈110〉 of three népouite polytypes derived from the three 1 T , 2 H 1 , and 2 H 2 lizardite polytypes. Relevant Blochwave simulation parameters: atomic potential = Bethe; atomic form factors = Peng-Ren-Dudarev-Whelan (PRDW); no. of strong reflections = 50
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HR filtered (average background subtracted) images of <span class="search-highlight">népouite</span> crystals: ( ...

HR filtered (average background subtracted) images of népouite crystals: ( ...

Published: 01 April 2018
Figure 11. HR filtered (average background subtracted) images of népouite crystals: ( a and b ) refer to the same TEM image, as well as ( c and d ); only a drawing of the direct lattice has been added to b and d to emphasize the stacking. Note the local straight sequence to the left
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( a ) HR filtered (average background subtracted) image of <span class="search-highlight">népouite</span> showing...

( a ) HR filtered (average background subtracted) image of népouite showing...

Published: 01 April 2018
Figure 12. ( a ) HR filtered (average background subtracted) image of népouite showing many nanoflakes with preserved two-dimensional information; ( b and c ) enlargement of the square regions indicated in a , further filtered in the Fourier space using a periodical mask, and with drawings
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Powder XRD patterns of synthesized lizardite-<span class="search-highlight">nepouite</span> series [Si 2 Mg 3−x N...

Powder XRD patterns of synthesized lizardite-nepouite series [Si 2 Mg 3−x N...

Published: 01 February 2016
Figure 1 Powder XRD patterns of synthesized lizardite-nepouite series [Si 2 Mg 3−x Ni x O 5 (OH) 4 ].
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XRD patterns of (06–33) reflections of synthesized lizardite-<span class="search-highlight">nepouite</span> serie...

XRD patterns of (06–33) reflections of synthesized lizardite-nepouite serie...

Published: 01 February 2016
Figure 2 XRD patterns of (06–33) reflections of synthesized lizardite-nepouite series [Si 2 Mg 3−x Ni x O 5 (OH) 4 ].
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d (06–33) values (Å) vs. Ni content (x) in lizardite-<span class="search-highlight">nepouite</span> synthetic ser...

d (06–33) values (Å) vs. Ni content (x) in lizardite-nepouite synthetic ser...

Published: 01 February 2016
Figure 3 d (06–33) values (Å) vs. Ni content (x) in lizardite-nepouite synthetic series [Si 2 Mg 3−x Ni x O 5 (OH) 4 ]. The size of symbol denotes the error on the d (06–33) measurements.
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Selected regions of the MIR spectra of synthesized lizardite-<span class="search-highlight">nepouite</span> serie...

Selected regions of the MIR spectra of synthesized lizardite-nepouite serie...

Published: 01 February 2016
Figure 4 Selected regions of the MIR spectra of synthesized lizardite-nepouite series [Si 2 Mg 3 − x Ni x O 5 (OH) 4 ].
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Selected regions of the NIR spectra of synthesized lizardite-<span class="search-highlight">nepouite</span> serie...

Selected regions of the NIR spectra of synthesized lizardite-nepouite serie...

Published: 01 February 2016
Figure 5 Selected regions of the NIR spectra of synthesized lizardite-nepouite series [Si 2 Mg 3−x Ni x O 5 (OH) 4 ].
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TEM images of <span class="search-highlight">nepouite</span>-like minerals at the Aguablanca deposit. (a) Lattice...

TEM images of nepouite-like minerals at the Aguablanca deposit. (a) Lattice...

Published: 01 March 2011
Fig. 7. TEM images of nepouite-like minerals at the Aguablanca deposit. (a) Lattice-fringe image showing regular layers of lizardite; (b) Chl/Srp (14+7 Å) at the junction of chlorite and serpentine; (c) common intergrowth of chlorite and serpentine at these junctions; (d, e) Ni-(±Fe-Cu) particles
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F ig 3. a. <span class="search-highlight">Nepouite</span> showing platy morphology. b. Weathered serpentine. Not...

F ig 3. a. Nepouite showing platy morphology. b. Weathered serpentine. Not...

Published: 01 January 2002
F ig 3. a. Nepouite showing platy morphology. b. Weathered serpentine. Note the initiation of weathering along the boundaries of cleavage flakes. c. Nodular goethite with high Ni content. d. Pisolitic Cr-substituted hematite.
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(A) QEMSCAN map illustrating mineralogy and microstructure of Bon Accord Ni...

(A) QEMSCAN map illustrating mineralogy and microstructure of Bon Accord Ni...

Published: 24 April 2023
Figure 2. (A) QEMSCAN map illustrating mineralogy and microstructure of Bon Accord Ni-oxide deposit at 10 μm pixel resolution. Mineral assemblage is dominated by trevorite (~60 vol%; green) with nimite and népouite in groundmass. (B) Inset at 1 μm pixel resolution showing minor liebenbergite
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Infrared spectrum of the Ni-serpentine from Campello Monti in comparison wi...

Infrared spectrum of the Ni-serpentine from Campello Monti in comparison wi...

Published: 01 April 2018
Figure 8. Infrared spectrum of the Ni-serpentine from Campello Monti in comparison with the spectrum of népouite from Petea Mine (Soroako, Sulawesi Island, Indonesia) and that of pecoraite from Loma Peguera (Bonao, Dominican Republic), taken as reference ( Chukanov and Chervonnyi 2016 ).
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Projection of sepiolite-falcondoite composition (at. %) in Si-Ni-Mg ternary...

Projection of sepiolite-falcondoite composition (at. %) in Si-Ni-Mg ternary...

Published: 01 December 2009
F ig . 10. Projection of sepiolite-falcondoite composition (at. %) in Si-Ni-Mg ternary diagram. The figure also indicates the positions of the solid solution series between sepiolite-falcondoite, talc-willemseite and lizardite-nepouite ( Springer, 1974 ; Brand et al ., 1998 ).