Ba-rich celestine: new data and crystal structure refinement

Brigatti, Maria Franca; Galli, Ermanno; Medici, Luca

doi:10.1180/minmag.1997.061.406.10

Cited by 16 publications

(10 citation statements)

References 15 publications

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“…Thus, in our MBV6 specimen we may be likely dealing with the SrSO 4 -BaSO 4 Summarizing, the XRD and XRF data suggest that the celestite found is actually a (Sr,Ba)SO 4 terminal solid solution in the Sr-rich branch of the binary system [22]. This is not the only one result of our collection specific of the Molí del Baró 1 site.…”

Section: Resultsmentioning

confidence: 80%

New insights about the presence of celestite into fossil bones from Molí del Baró 1 site (Isona i Conca Dellá, Lleida, Spain)

et al. 2014

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We have addressed an X-ray fluorescence (XRF) and X-ray diffraction (XRD) on a collection of thirteen fossil bone belonging to the Molí del Baró 1 paleontological site located near Sant Romà d'Abella (Isona i Conca Dellà Municipality, Lleida Province, Spain, dated to about 66.5 Ma, to investigate the fossilization occurred in this site in terms of physico-chemical properties. As a general behaviour, the XRD patterns showed the bioapatite mineral at a varying level of percentage, and accordingly, the correspondent XRF spectra turned out to be mainly dominated by the presence of Ca, obviously accompanied by phosphorus. Simultaneously, other elements such as Sr, Fe, Ba and Zn were found at non-negligible concentration levels and helped to assign the phase components in the XRD spectra. In three specimens, it was observed by XRD the rather unusual case where the original bioapatite bone mineral was completely substituted for by other mineralogical phases. In addition to this, celestite was also found as an important phase in ten specimens out of the thirteen examined. The occurrence of celestite in the bone structure appears a rather unusual observation within the literature of bones diagenesis. Its provenance is generally ascribed to marine vertebrate organisms, but the presence in the fossil bones of this site, where no evidence of marine environment exists, can be reconciled with occurrence of refluxing processes involving diagenetically altered fluids which were discharged into beds containing strontium sulphate-rich waters.

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Section: Resultsmentioning

confidence: 80%

New insights about the presence of celestite into fossil bones from Molí del Baró 1 site (Isona i Conca Dellá, Lleida, Spain)

et al. 2014

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“…Strontium-oxygen (Sr-O) bond lengths are in the range 2.51-3.25 Å, and sulfur-oxygen (S-O) bond lengths are in the range 1.45-1.48 Å. In terms of the geometry of the (SO4) and (Sr-O12) polyhedra the celestine structure is most distorted than the barite structure [5][6][7][8][9][10][11].…”

Section: Resultsmentioning

confidence: 99%

“…Further, the crystal structure of celestine has been refined also in the space group Pbnm by Jacobsen et al [7], Antao [8], Garske and Peacor [10], Miyake et al [13], Sitepu and Zaidi [14]. The celestine crystal structure was also refined in the space group Pnma by Hawthorne and Ferguson [9] and Brigatti et al [11].…”

Section: Resultsmentioning

confidence: 99%

Celestine from Valea Sarii (Vrancea region): New Data and Crystal Structure Refinement

Branoiu¹,

Aura²,

Cursaru³

et al. 2020

Rev. Chim.

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In the paper has been analyzed the crystal structure of a celestine sample from Valea Sarii (Vrancea region, Romania) located in the Eastern Carpathians Foredeep. The celestine sample was also studied by optical microscopy, chemical and thermal analysis. The unit cell parameters of the celestine structure refined in the space group Pnma were: a=8.39769 �, b=5.38415 �, c=6.88167 �, Z=4. The chemical composition of the celestine crystals was determined by EDX analysis. The optical characteristics of the sample were studied by optical microscopy. A new set of the unit cell parameters and fractional coordinates of the celestine crystal structure were determined. Also were determined the bond lengths in the Sr-O12 and SO4 polyhedra. The sample was collected in the massive mineralization area of the Valea Sarii ore deposit, the largest celestine ore deposit in Romania.

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“…1) suggest the formation of single-phase Ba 0.12 Sr 0.88 SO 4 compound. The compound exhibits Orthorhombic structure (space group P n m a) in correspondence with the JCPDS database of card number 96-900-9507 [17]. The (h k l) values of most prominent peaks and the corresponding d-values are shown in the XRD pattern.…”

Section: Structural Studiesmentioning

confidence: 99%

Excitation of thermoluminescence in Eu doped Ba0.12Sr0.88SO4 nanophosphor by low energy argon ions

Choubey

Sharma

Lochab

et al. 2011

Journal of Luminescence

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Ba-rich celestine: new data and crystal structure refinement

Abstract: A Ba-rich celestine (SrOX7BaO 13S04) filling cavities of volcanoclastic rocks from Montecchio Maggiore (Vicenza, lIaly) was studied. The role of the Ba content in the mineral was determined using X-ray powder data, single crystal X-ray refinement, thermal and chemical a!1alyses.

Cited by 16 publications

References 15 publications

New insights about the presence of celestite into fossil bones from Molí del Baró 1 site (Isona i Conca Dellá, Lleida, Spain)

New insights about the presence of celestite into fossil bones from Molí del Baró 1 site (Isona i Conca Dellá, Lleida, Spain)

Celestine from Valea Sarii (Vrancea region): New Data and Crystal Structure Refinement

Excitation of thermoluminescence in Eu doped Ba0.12Sr0.88SO4 nanophosphor by low energy argon ions

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