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Wednesday, August 12, 2020 | History

2 edition of X-Ray study of lizardite and certain nickel serpentines found in the catalog.

X-Ray study of lizardite and certain nickel serpentines

John Christopher Rucklidge

X-Ray study of lizardite and certain nickel serpentines

by John Christopher Rucklidge

  • 93 Want to read
  • 32 Currently reading

Published by s.n.] in [s.l .
Written in English

    Subjects:
  • Nickel ores,
  • Minerals,
  • Mineralogy

  • Edition Notes

    Statementby John Christopher Rucklidge.
    Classifications
    LC ClassificationsQE"390.2"N53"R83
    The Physical Object
    Pagination236 p.
    Number of Pages236
    ID Numbers
    Open LibraryOL21659223M

    The antigorote has more lines on X-ray spectra and they are clearer. Next to the reflex at Å there are reflexes in the and Å. The most common polytypes of chrysotile and lizardite are best distinguished in the range of - Å. Lizardite 1T has no lines and   Oxygen isotopes in oceanic serpentines range from + to +‰, with the majority between +3 and +7‰ (Fig. 2 B).Isotopic variation is due to the temperature dependence of serpentine-water δ 18 O fractionation and the exchange of oxygen isotopes between the fluids and basaltic ocean crust ().This can be seen in the δ 18 O of fluids venting at mid-ocean ridge hydrothermal systems, .

    From Whittaker's study (a,b,c) and Whittaker and Zussman (), it appears that clinochrysotile is the most abundant, ortho-chrysotile is next most abundant, and parachrysotile is fairly rare or mixed with the other two in small amounts. Lizardite. Observations under the electron microscope show that lizardite. and lizardite and on the lizardite from the type locality, Ken- nack Cove, The Lizard, Cornwall, England. The solution test differentiates quantitatively between chrys>otile and the pair of platy phases lizardite-antigorite. The identity of the platy phase must 'be determined by X-ray methods. Early work on.

    The dehydroxylation temperature of lizardite in this study is obviously lower than that of serpentine minerals (i.e., lizardite, antigorite, and chrysotile) reported by Viti (). After hydrothermal treatment, the mass loss of dehydroxylation dramatically decreases and a new mass loss occurs at approximately °C (Figs. 2 b and 2 c).   of nickel compounds encountered in the nickel-refining industry in humans (IARC ). In an additional study, nickel-refinery work-ers exposed primarily to soluble nickel compounds had a significant excess risk of lung cancer, and smoking and nickel exposure had a synergistic effect on cancer risk (Anderson et al. ). These work-.


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X-Ray study of lizardite and certain nickel serpentines by John Christopher Rucklidge Download PDF EPUB FB2

Lizardite. Lizardite is a serpentine group mineral of the phyllosilicate class of silicates. It is a trioctahedral phyllosilicate (clay) mineral. The tetrahedral sheet is mainly dominated by Si and the octahedral sheet is dominated by Mg in the lizardite end member.

The lizardite used for all experiments was obtained from Donghai, Jiangsu Province, China. Mineralogical and X-ray powder diffraction data confirmed that the lizardite sample was of high purity with trace amounts of chlorite and amphibole ().The chemical analysis of the sample is shown quantitatively in Table sample consists of mainly % SiO 2, % MgO and % by: The nickel-bearing serpentines, chlorites, and related mineral species found in laterite ores from California and New Caledonia were identified by detailed mineralogical, optical, chemical, x-ray diffraction, differential thermal, and infrared spectra on micrographs were prepared to define the morphology of each by:   In our current study, synthesis was carried out in the systems NiO–Al 2 O 3 –SiO 2 –H 2 O and CoO–Al 2 O 3 –SiO 2 –H 2 O.

The reactions studied were 1 kaolinite + Ni(OH) 2 and 1 kaolinite + Co(OH) 2 at temperatures of °C. A solid/solution ratio = was used in all the reactions ().The hydrothermal treatments were conducted in 50 cm 3 Teflon-lined reactors (Parr Cited by: 1.

The decrease from 34% (wt.%) to % (wt.%) of serpentines (lizardite) in the X sample also indicates that almost all of the nickel was extracted from this phase and goethite is the phase in the residue with more nickel.

The higher amount of magnesium dissolution from serpentines affected the extraction of the nickel incorporated into by: 5. 1. Introduction. Reduction of nickel oxide by H 2 (1) NiO + H 2 → Ni + H 2 O is irreversible, since the equilibrium constant, K p, varies from 10 3 to 10 2 in the temperature range 0– °C, and the reaction is only slightly exothermic.

Extensive studies on reaction (1) have appeared in the literature, due to its practical importance in the reduction of nickel ores and catalysts. J.T. Kloprogge, in Developments in Clay Science, The Serpentine Group Minerals.

The serpentine group minerals (mainly lizardite, antigorite and chrysotile) form the Mg-rich trioctahedral equivalent of the kaolinite group with the same layer structure but all the positions in the octahedral sheet are filled with Mg 2 +.Lizardite shows an ideal layer topology owing to shifts of.

The effect of lizardite surface characteristics on pyrite flotation has been investigated through flotation tests, adsorption tests, zeta potential measurements, FTIR study, X-ray photoelectron.

X-Ray ion stuilies: Identification of the serpentines, chlorites and related species was based in part on f-ray difiraction data. Lizardite, clino-chrysotile, ortho-chrysotile and antigorite were identified using r-ray data. compiled by Whittaker and Zussman ().

Septeamesite. Two varieties of serpentines, antigorite and lizardite originated from dunite and peridotite, respectively, were previously undergone heat treatment in the range from to °C and then.

Complementary X-ray diffraction and spectroscopy. Figure 1 highlights the complementary use of µ-XRD and µ-XAS to identify solid phase minerals which contain Ni. A high-resolution photograph (Fig. 1a) shows a mineral in the petrographic thin section of sample “s20unt” region 4 upon which µ-XRF, µ-XRD, and µ-XAS were carried out.

The red box on the photograph indicates. Lizardite, the flat species, forms in sufficiently large and well-ordered crystals to permit reliable X-ray structure determinations, and it is the reference mineral for estimates of the.

The crystal structure of lizardite-1T from Gew-graze, Cornwall, has been refined by single-crystal X-ray diffractionto R1 of andfor two crystals having P31m space group and lattice. Serpentine is a very common mineral, and is found in abundance worldwide.

Some famous localities include The Lizard Peninsula, Cornwall, England (the type locality of Lizardite; the Antigorio Valley, Piedmont, Italy (the type locality of Antigorite); and Mount Olympus, Jeffery Asbestos Mine in Richmond Co., Quebec, is the one of the most productive asbestos mines, providing great.

Formation of glushinskite (MgC 2 O 4 2H 2 O) was also observed when oxalate was accumulated to certain concentrations in the solution. Overall, this study showed that the isolated Talaromyces sp. was a promising bioagent to improve the efficacy of cation release from serpentine minerals for the purpose of carbon sequestration and resource.

Lizardite is volumetrically the most common serpentine species. Lizardite-Népouite Series. See also the closely related antigorite and chrysotile.

Chrysotile and lizardite are the low-temperature serpentine minerals, whereas antigorite is the high-temperature (>°C) serpentine mineral. Serpentinite is a rock composed of one or more serpentine group minerals, the name originating from the similarity of the texture of the rock to that of the skin of a snake.

Minerals in this group, which are rich in magnesium and water, light to dark green, greasy looking and slippery feeling, are formed by serpentinization, a hydration and metamorphic transformation of ultramafic rock from.

lizardite composition, paragenesis, and for. Grolocrc sETTING Samples for this study were taken from well-character-ized lizardite-chrysotile serpentinites from chrysotile as-bestos deposits for which mineral parageneses were known from X-ray diffraction studies and for which petrologic, stable isotope, and major-element compositional data.

Lizardite (Whittaker, E.J.W. & Zussman, J. ), after its discovery location in Kennack Cove, the Lizard, Cornwall, England. Composition & Properties. General formula of this group of minerals: Mg 6 [(OH) 8 |Si 4 O 10]. Antigorite and chrysotile are silicates, subclass sheet silicates, monoclinic system, and lizardite – trigonal and.

OXYGEN AND CARBON ISOTOPE OF SERPENTINES, MAGNETITES, AND CALCITES Serpentine and Magnetite. Oxygen isotope results for serpentine are reported in Table 6. The oxygen isotope compositions for all the lizardite samples are strongly enriched in 18 O (between ‰ and ‰), in comparison to the normal mantle 18 O values for fresh peridotite olivine and pyroxene minerals (5‰.

ratios of serpentines in primitive carbonaceous chondrites (Brearley and Jones, ), whose study has relevance to the mineralogy of serpentines.

In lizardite, the layers are flat (Whittaker and Zussman, ), the geometric misfit of planar t and o sheets being accommodated principally by a cou-pled rotation of SiO4 tetrahedra in the plane of the.[5] Serpentines are tri‐octahedral sheet silicates (Mg 3 Si 2 O 5 [OH] 4) that include four main structural types: lizardite (planar structure), chrysotile (cylindrical structure), polygonal serpentine (tubular with a polygonized section) and antigorite (modulated structure) (cf.

review by Wicks and O'Hanley).Two types of serpentines found in nickel ores from New Caledonia are primary serpentine formed by hydration of olivine and secondary nickelliferous serpentines. defined according to X-ray.