Serpentinites: Mineral Structure, Properties and Technological Applications

Carmignano, Ottávio; Vieira, Sara S.; Brandão, Paulo Roberto Gomes; Bertoli, Alexandre C.; Lago, Rochel M.

doi:10.21577/0103-5053.20190215

Cited by 21 publications

(19 citation statements)

References 53 publications

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Section: Methodsmentioning

confidence: 99%

“…In this mineral, 1:1 flat layers of sheets of SiO 4 tetrahedra and sheets of MgO 2 (OH) 4 octahedra are linked by hydrogen bonds. The most common polytypic is the stacking of three layers without any lateral shift [64]. To confirm that the mineral sample was not contaminated, a mass spectroscopy thermal analysis was carried out for the cleaned serpentinite sample.…”

Section: Mineral/hcn Samplesmentioning

confidence: 99%

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A Lizardite–HCN Interaction Leading the Increasing of Molecular Complexity in an Alkaline Hydrothermal Scenario: Implications for Origin of Life Studies

Villafañe-Barajas

Ruíz-Bermejo

Rayo-Pizarroso

et al. 2021

Life

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Hydrogen cyanide, HCN, is considered a fundamental molecule in chemical evolution. The named HCN polymers have been suggested as precursors of important bioorganics. Some novel researches have focused on the role of mineral surfaces in the hydrolysis and/or polymerization of cyanide species, but until now, their role has been unclear. Understanding the role of minerals in chemical evolution processes is crucial because minerals undoubtedly interacted with the organic molecules formed on the early Earth by different process. Therefore, we simulated the probable interactions between HCN and a serpentinite-hosted alkaline hydrothermal system. We studied the effect of serpentinite during the thermolysis of HCN at basic conditions (i.e., HCN 0.15 M, 50 h, 100 °C, pH > 10). The HCN-derived thermal polymer and supernatant formed after treatment were analyzed by several complementary analytical techniques. The results obtained suggest that: I) the mineral surfaces can act as mediators in the mechanisms of organic molecule production such as the polymerization of HCN; II) the thermal and physicochemical properties of the HCN polymer produced are affected by the presence of the mineral surface; and III) serpentinite seems to inhibit the formation of bioorganic molecules compared with the control (without mineral).

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Section: Methodsmentioning

confidence: 99%

Section: Mineral/hcn Samplesmentioning

confidence: 99%

A Lizardite–HCN Interaction Leading the Increasing of Molecular Complexity in an Alkaline Hydrothermal Scenario: Implications for Origin of Life Studies

Villafañe-Barajas

Ruíz-Bermejo

Rayo-Pizarroso

et al. 2021

Life

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“…An additional peak occurring with dhkl value of 8.07Å could be assigned to chrysotile. Lizardite is an ample serpentine mineral having flatty crystal where the substitutions of Fe 3+ and Ni 2+ for Mg 2+ in its structure are possible, whereas chrysotile is less abundant and is characterized by tabular and fibrous crystals [15].…”

Section: A Petrology and Mineralogy Of Ultramafic Hostmentioning

confidence: 99%

The Latowu Ultramafic Rock-Hosted Iron Mineralization in the Southeastern Arm Sulawesi, Indonesia: Characteristics, Origin, and Implication for Beneficiation

Sufriadin¹,

Widodo²,

Thamrin³

et al. 2021

Int. J. Adv. Sci. Eng. Inf. Technol.

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Latowu ultramafic block in the Southeastern Arm Sulawesi locally hosts elevated concentrations of Fe in addition to Ni. We investigated both host rock and mineralized samples' mineralogy and chemistry to find out mineralogical and chemical characteristics and interpret the iron mineralization process with beneficiation implications. The mineralogical nature of the samples was analyzed using optical microscopy and X-ray diffractometry (XRD) methods. The whole-rock and mineral chemistry analyses were performed using X-ray fluorescence (XRF) spectroscopy and electron probe microanalysis (EPMA) techniques. The analysis showed that the ultramafic rocks had been undergone a strong to complete serpentinization degree where lizardite appears to be the predominant mineral. Magnetite in this research comprised the principal iron-bearing mineral and functioned as discrete fine-grains and subhedral to anhedral crystals. Magnetite occurs as fragments in breccia, alteration rim in spinel, fine-grained disseminations, and micro veins. This research found that the whole-rock chemistry of an ultramafic breccia showed an elevated concentration in Fe2O3 with a grade of 28.44 wt%. Electron probe analysis of magnetite shows a wide variation of Fe ranging from 31.10 wt% to 67.20 wt%. It is interpreted that the formation of magnetite within ultramafic rocks is influenced by the hydration of primary minerals, mainly olivine. Iron is most likely released from olivine or pyroxene crystals during serpentinization, and the higher water content of serpentine promotes its mobility. It is suggested that the magnetic separation method can be potentially used to increase the Fe grade.

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“…There are three main crystalline modifications of serpentine minerals: antigorite, lizardite, and chrysotile [3]. In addition, isomorphic substitutions of magnesium and silicon are possible, and the general formula can be represented as Mg 3-x (M) x Si 2-y (T) y O 5 (OH) 4 , where M-Mg 2+ , Fe 2+ , Fe 3+ , Al 3+ , Ni 2+ , Mn 2+ , Zn 2+ , and T-Si 4+ , Al 3+ , Fe 3+ [4]. The use of serpentinites is problematic due to the wide variety of their properties, which hinders development of effective technologies.…”

Section: Introductionmentioning

confidence: 99%

In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content

et al. 2021

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Serpentine heat treatment at temperatures of 650–750 °C yields magnesium–silicate reagent with high chemical activity. Precise and express control of roasting conditions in laboratory kilns and industrial aggregates is needed to derive thermally activated serpentines on a large scale. Color change in serpentines with a high iron content during roasting might be used to indicate the changes in chemical activity in the technological process. This study gives a scientific basis for the express control of roasting of such serpentines by comparing the colors of the obtained material and the reference sample. Serpentines with different chemical activity were studied by X-ray diffraction, Mössbauer spectroscopy, and optical spectroscopy. The color parameters were determined using RGB (red, green, blue), CIELAB (International Commission on Illumination 1976 L*a*b), and HSB (hue, brightness, saturation) color models. The color of heat-treated samples was found to be affected by changes in the crystallochemical characteristics of iron included in the structure of the serpentine minerals. The color characteristics given by the CIELAB model were in good coherence with the acid-neutralizing ability and optical spectra of heat-treated serpentines. Thus, in contrast to the long-term analysis by these methods, the control by color palette provides an express assessment of the quality of the resulting product.

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Serpentinites: Mineral Structure, Properties and Technological Applications

Cited by 21 publications

References 53 publications

A Lizardite–HCN Interaction Leading the Increasing of Molecular Complexity in an Alkaline Hydrothermal Scenario: Implications for Origin of Life Studies

A Lizardite–HCN Interaction Leading the Increasing of Molecular Complexity in an Alkaline Hydrothermal Scenario: Implications for Origin of Life Studies

The Latowu Ultramafic Rock-Hosted Iron Mineralization in the Southeastern Arm Sulawesi, Indonesia: Characteristics, Origin, and Implication for Beneficiation

In Situ Control of Thermal Activation Conditions by Color for Serpentines with a High Iron Content

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