Minerals from Macedonia XXIII. Spectroscopic and structural characterization of schorl and beryl cyclosilicates

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Petre Makreski, Gligor Jovanovski

Abstract

IR and Raman spectroscopy study on two collected cyclosilicate species: schorl (from tourmaline group), Na(Fe,Mg)(3)Al(6)(BO(3))(3)Si(6)O(18)(OH,F)(4) and beryl (Be,Mg,Fe)(3)Al(2)Si(6)O(18) were carried out. Although beryl is nominally anhydrous mineral, vibrational results strongly indicate that H(2)O molecules exist in the structural channels. The number of vibrational bands and their frequencies revealed the presence of H(2)O type II, in which C(2) symmetry axis of the water molecule is parallel to the structural channel (and to the c-axis of beryl). On the other hand, it was found that observed bands in the IR and Raman OH stretching region of the other tourmaline varieties appear as a result of the cation combinations involving dominant presence of Mg and Fe cations in the Y structural sites. The strong indication derived from the vibrational spectroscopic results that the studied mineral represents a schorl variety, coincide very well with the results obtained by powder X-ray diffraction and X-ray microprobe analysis. Both minerals show IR spectral similarities in the region below 1500 cm(-1), whereas the resemblance between the Raman spectra (1500-100 cm(-1)) is less expressed confirming that these spectra are more sensi...Continue Reading

References

May 4, 2000·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·J T Kloprogge, R L Frost

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Citations

Nov 22, 2011·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·J JehličkaH G M Edwards
Mar 28, 2020·Beilstein Journal of Nanotechnology·Changqiang YuDionysios D Dionysiou
Dec 6, 2020·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·A V SpivakT V Setkova

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