Ranciéite from Mazzano Romano (Latium, Italy)

Barrese, E.; Giampaolo, C.; Grubessi, O.; Mottana, Annibale

doi:10.1180/minmag.1986.050.355.14

Cited by 7 publications

(6 citation statements)

References 9 publications

(12 reference statements)

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“…Large cations, mainly Ca 2+ , and H 2 O are located between the layers . Our ranciéite sample Ra1 was collected at Mazzano Romano (Italy) and has been extensively studied and characterized by another literature …”

Section: Resultsmentioning

confidence: 99%

Raman spectra of natural manganese oxides

Bernardini

Bellatreccia

Municchia

et al. 2019

J Raman Spectroscopy

146

182

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Manganese oxides occur typically as cryptocrystalline and fine-grained mixtures of different Mn-phases, carbonates, silicates, and Fe oxides/hydroxides; thus their characterization by standard methods, such as X-ray diffraction, is extremely challenging. These materials have been widely used in various applications over the millennia, for example, in art works as pigments for pottery, mural paintings, stained glass, and recently, as nanostructured materials with very attractive physicochemical properties. Furthermore, they are important geomaterials that could play a key role in environmental applications, by controlling the partitioning of arsenic and heavy metals between rocks, soils, and aqueous systems. Raman spectroscopy, which is a punctual and nondestructive technique, has been widely used to characterize these materials. However, literature data are often conflicting and contradictory, usually not allowing a proper identification of the Mn species. In this work, we characterize the most common natural manganese oxides by combining X-ray powder diffraction, Fourier-transform infrared spectroscopy, and Raman spectroscopy. Our data show that some manganese oxides have characteristic Raman spectra and can be easily recognized by using Raman spectroscopy alone, whereas integration of Raman data with other techniques is mandatory to characterize minerals that have almost identical Raman spectra. With this respect, Raman spectroscopy is the only technique allowing an easy discrimination between hollandite [Ba(Mn 4+ 6 ,Mn 3+ 2 )O 16 ] and cryptomelane [K(Mn 4+ 7 ,Mn 3+ )O 16 ]. The final goal of this work is to provide reference Raman spectra, acquired on previously well-characterized Mn samples to facilitate the application of Raman spectroscopy in the study of these geomaterials.

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Section: Resultsmentioning

confidence: 99%

Raman spectra of natural manganese oxides

Bernardini

Bellatreccia

Municchia

et al. 2019

J Raman Spectroscopy

146

182

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“…The observed d (001) value of 7.66A, however, is higher than most other studied rancieites which have d(001) of 7.44 to 7.57,~ (Bardossy & Brindley 1978;Chukhrov et al 1979;Barrese et al 1986;Kim 1991;Brannath & Smykatz-Kloss 1992; Table 1). Since, according to Chukhrov et al (1979) and Kim (1980), there is a positive correlation between the variations of d(001) and the H20content, the high d(001) value of rancieite from Kato Nevrokopi can be mainly attributed to its high H20-content.…”

Section: X-ray Crystallographymentioning

confidence: 58%

“…Hence, rancieite was deposited under high humidity conditions, at atmospheric pressure and very low temperatures (around 25°C, see also Barrese et al 1986) from cold meteoric waters, percolating through the marble and the associated orebodies for long periods. The dissolution of calcite, increases the concentration of Ca and the pH (to c. 7-8) of the fluids.…”

Section: Discussionmentioning

confidence: 99%

“…Kim (1980) suggested that there are two solid solution series, one for birnessite and one for rancieite; rancieite being more hydrated of the two, with an average of 2.8 water molecules per formula unit. Barrese et al (1986) concluded from the results of electron microprobe analysis and thermogravimetric studies that the correct formula for rancieite is CaMn409.4H20 and noted some substitution of Mg and Ba for Ca in their samples. Carlos et al (1993) found rancieite deficient in Mn and Ca, but with unusual concentration of Si, Ti, Fe, Mg, Zn, Ba, Ce and Pb.…”

Section: • 4+mentioning

confidence: 99%

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Zincian rancieite from the Kato Nevrokopi manganese deposits, Macedonia, northern Greece

Nimfopoulos

Michailidis

Christofides

1996

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At the 25th km main Mn-mine of Kato Nevrokopi, Macedonia, northern Greece, rancieite forms flaky to laminated aggregates encrusting vugs, and replacing pyrolusite and todorokite in massive deposits of the Falakron marbles. It has an unusually high ZnO (1.53-3.07 wt%) content and therefore it was named 'zincian rancieite'. The average (18 spots) chemical composition of rancieite by EPMA is (wt%): MnO2 62.01, CaO 6.83, ZnO 2.54, A1203 1.18, MgO 0.63 plus minor oxides (Fe203, K20 & SiO2), total of 73.98. Assuming H20-content as 26.02 (100 -73.98) wt%, these data reflect the following empirical formula: (Ca0.67Zn0.17A10.12Mg0.09 3+

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“…The initial precipitation of Fe-bearing phases is due to their higher precipitation rates with respect to Mn ones [54][55][56][57][58].…”

Section: Xrf Characterizationmentioning

confidence: 99%

Mineralogical and Geochemical Characterization of Asbestiform Todorokite, Birnessite, and Ranciéite, and Their host Mn-Rich Deposits from Serra D’Aiello (Southern Italy)

Bloise

Miriello

Rosa

et al. 2020

Fibers

Self Cite

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Manganese ores, especially the oxyhydroxides in their different forms, are the dominant Mn-bearing minerals that occur in marine and terrestrial environments, where they are typically found as poorly crystalline and intermixed phases. Mn oxyhydroxides have a huge range of industrial applications and are able to exert a strong control on the mobility of trace metals. This paper reports the results of a detailed study on the Mn oxyhydroxides occurring in the manganiferous deposit outcropping in the Messinian sediments from Serra D’Aiello (Southern Italy). Nine Mn samples were characterized in detail using X-ray powder diffraction (XRPD), differential scanning calorimetry (DSC), thermogravimetry (TG), transmission electron microscopy combined with energy dispersive spectrometry (TEM/EDS), and X-ray fluorescence (XRF). The results indicated that the Mn deposit included the oxyhydroxide mineral species birnessite, todorokite, and rancièite. The size, morphology, and chemical composition of Mn oxyhydroxide samples were investigated in order to define their impact on the environment and human health. Todorokite displayed asbestiform shapes and could disperse fibers of breathable size in the air. Furthermore, since in-depth characterization of minerals within Mn deposits may be the first step toward understanding the genetic processes of manganese deposits, hypotheses about the genesis of the Mn oxyhydroxide deposits were discussed.

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Ranciéite from Mazzano Romano (Latium, Italy)

Cited by 7 publications

References 9 publications

Raman spectra of natural manganese oxides

Raman spectra of natural manganese oxides

Zincian rancieite from the Kato Nevrokopi manganese deposits, Macedonia, northern Greece

Mineralogical and Geochemical Characterization of Asbestiform Todorokite, Birnessite, and Ranciéite, and Their host Mn-Rich Deposits from Serra D’Aiello (Southern Italy)

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