The isomorphous series lizardite-nepouite

Maksimovich, Z.

doi:10.1080/00206817509471591

Cited by 6 publications

(11 citation statements)

References 7 publications

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“…In contrast, other authors proved a structure with talc affinity, since kerolite and pimelite do not exhibit intracrystalline swelling (e.g. Slansky, 1955;Kato, 1961;Maksimović, 1973;Brindley and Hang, 1973). In addition, an intermediate phase between talc-like and serpentinelike end members, karpinskite (Mg,Ni) 2 Si 2 O 5 (OH) 2 , was described by Rukavishnikova (1956), however it is not accepted as a mineral species by the IMA.…”

Section: Accepted Manuscriptmentioning

confidence: 98%

Garnierites and garnierites: Textures, mineralogy and geochemistry of garnierites in the Falcondo Ni-laterite deposit, Dominican Republic

Villanova-de-Benavent

Proenza

Galí

et al. 2014

Ore Geology Reviews

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Section: Accepted Manuscriptmentioning

confidence: 98%

Garnierites and garnierites: Textures, mineralogy and geochemistry of garnierites in the Falcondo Ni-laterite deposit, Dominican Republic

Villanova-de-Benavent

Proenza

Galí

et al. 2014

Ore Geology Reviews

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“…Indexing for the Wolf Creek (PDF 22-754) and Missouri pecoraite was performed by comparison with the data for clinochrysotile 2Mc/ (PDF 21-1262) (Faust et al, 1969;Milton et al, 1983). The unit-cell dimensions for the late-formed pecoraite were computed on the basis of the unit-cell of the Wolf Creek pecoraite by using least squares method (Table 1) Nepouite has been indexed using a one-layer trigonal cell (1T polytype) (Maksimovid, 1973;Maksimovich, 1975;Bayliss, 1981), or a two-layer orthorhombic cell (20r polytype) (Brindley & Wan, 1975). Nepouite in PDF 25-524 has been indexed using 20r polytype and by comparison with chrysotile 20r (PDF 25-645).…”

Section: E X P E R I M E N T a L P R O C E D U R E Smentioning

confidence: 99%

“…Three other occurrences have been reported in an oxidized Ni sulphide ore deposit also in Western Australia (Nickel, 1973;Nickel et aL, 1979), in chromite ore in Pennsylvania (Hess, 1980), and in quartz-calcite geodes in Missouri (Milton et al, 1983). Nepouite, introduced by Glasser (1907), has been redefined by Maksimovi6 (1973) as the Ni analogue of lizardite, and has since been relatively well studied by others (Brindley & Pham Thi Hang, 1973;Brindley & Wan, 1975;Maksimovich, 1975;Bayliss, 1981;Manceau et al, 1985;Manceau & Calas, 1986). Bayliss (1981) indexed the X-ray powder patterns of several specimens as the 1T polytype.…”

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confidence: 99%

New occurrence and characterization of Ni-serpentines in the Kwangcheon area, Korea

1995

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A B S T R A C T:Pecoraite and nepouite, Ni-serpentines, occur in the serpentinized ultrarnafic rocks in the Kwangcheon area, Korea, where the parent rock is classified as harzburgite and/or lherzolite. Pecoraite was precipitated twice from the solution; the early-formed pecoraite coexists with magnetite, millerite, and polydymite both in the Buk-and Nam-sites, while the late-formed pecoraite appears as well-grown colloform and opaque-free phase only in the Buk-site. The typical colloform texture of the late-formed pecoraite strongly indicates that it was precipitated from the solution in supergene conditions. Pecoraite is characterized by its extremely high Ni content and the difference in Fe content between the early-and late-formed pecoraite. Nepouite is distinguished from pecoraite by its prismatic morphology and the large degree of isomorphous substitution between Ni and Mg. The phase relations among coexisting magnetite-millerite-polydymite assemblage with the earlyformed pecoraite suggest that the pecoraite might have precipitated in the extremely limited fo2 and .fs2 environment from the highly Ni-concentrated solutions and is stable at 25~ and 1 bar.

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“…Tetrahedral substitution is variable and the sum of octahedral cations is 2.85 on average (AE0.09). This serpentine is therefore classified as an intermediate phase between the Mg and Ni end-members of the Ni-Cu sheet silicates in the Aguablanca deposit, Spain lizardite-nepouite series (e.g., Brindley & Wan, 1975;Maksimović, 1975;Manceau & Calas, 1985, although it shows a greater tendency towards the nepouite composition (Ni . Mg and Ni .…”

Section: Aem Datamentioning

confidence: 99%

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

Suárez¹,

Nieto²,

Velasco³

et al. 2011

ejm

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Supergene alteration in the Aguablanca Ni-Cu-(PGE, platinum group elements) magmatic sulphide deposit (SW Spain) has formed distinctive soil profiles overlying the gabbroic host rocks. These profiles have subsurficial clayey horizons exceptionally enriched in Ni and Cu even in areas distant from the orebodies and the related gossan outcrops. A preliminary study of the mineralogy in these profiles including bulk analyses by electron microprobe (EMP) and energy dispersive X-ray spectrometry (EDS), showed that outstanding base-metal contents are retained by sheet silicates. Lizardite and clinochlore are the most remarkable Ni and Cu scavengers (up to 44 wt% NiO and 9 wt% CuO), with smectite, vermiculite and corrensite playing a subordinate role in this retention (up to 4 wt% NiO and 3 wt% CuO). These results suggest that Ni and Cu could be within the structure of these sheet silicates, but transmission electron microscopy (TEM) imaging has revealed that Ni, and especially Cu, also occur as discrete metallic particles. Notable differences are detected in the redistribution of base-metals among the major carriers after sulphides dissolution in supergene conditions. Copper is largely retained as native particles in sheet-silicates, particularly in chlorite, whereas Ni is largely bound to the structure, especially in serpentine. This reflects variable metal-retention mechanisms by sheet silicates at Aguablanca, related not only to the host phases but also to the low-temperature conditions in the deposit. Detailed analysis and imaging of the individual Ni-Cu-bearing phases were used to evaluate these retention processes.

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The isomorphous series lizardite-nepouite

Cited by 6 publications

References 7 publications

Garnierites and garnierites: Textures, mineralogy and geochemistry of garnierites in the Falcondo Ni-laterite deposit, Dominican Republic

Garnierites and garnierites: Textures, mineralogy and geochemistry of garnierites in the Falcondo Ni-laterite deposit, Dominican Republic

New occurrence and characterization of Ni-serpentines in the Kwangcheon area, Korea

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

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