International Journal of Current Research and Review
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IJCRR - 9(16), August, 2017

Pages: 12-16

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Characterization of Gem and Abrasive Variety Corundum from Wyra Area of Khammam Schist Belt, Telangana, India, Using Advanced Spectroscopic Techniques

Author: S. U. Shyam Kumar, N. Shadakshara Swamy

Category: General Sciences

Abstract:Corundum of varying qualities occurring in association with Khammam schist belt are studied with respect to their Geochemical and Mineralogical aspects. Studies have been carried out using the advanced spectroscopic techniques namely, Photoluminescence, UV-Visible, FT-IR, Raman and EDXRF analysis. The results obtained from the studies shows the predominance of colour causing element Cr and other associated elements like, Ti, V and Ga in Red variety of corundum than the abrasive corundum crystals, while Fe is found predominant in colourless or abrasive variety. From EDXRF studies the presence of impurity ions in the crystal lattice is quantified and its effect on the corundum crystal has been ascertained.

Keywords: Corundum, Ruby, Telangana, Spectroscopy, Cause of colour

DOI: 10.7324/IJCRR.2017.9163

Full Text:


In and around Wyra taluk in the Khammam district of Telangana, India, occurrences of corundum of abrasive variety and rarely of gem variety are observed. The study area lies in the Khammam schist belt (KSB) which is a continuation and part of the Nellore-Khammam Schist belt     (NKSB) (Ramam and Murthy, 1997).

  The main lithology of the area include amphibolite, schists, and gneisses of varying  compositions, anorthosites, pegmatites and quartz veins, corundum bearing  magnesium and aluminum rich pelitic granulites and hornblende pyroxene granulites (Ramam and Murthy, 1997; Patil, 1973). Metamorphosed pelitic, psammitic and calcareous sediments are represented by garnetiferous biotite- muscovite-kyanite-chlorite schists, kyanite and sillimanite bearing meta - pelitic schists, calc -silicate rocks, quartzites, fuchsite, and magnetite quartzite. The meta-sedimentary unit is tectonically emplaced below a metavolcanic unit made up of quartz-chlorite schists, hornblende schists and tonalitic gneisses (Ramam and Murthy,1997; Leelanandam and Narasimha,1988; Narayan and Pavanaguru, 2013).

The main host rocks for corundum in the study area are sillimanite-corundum schist and kyanite schists. These pelitic schists hosting corundum are found to be in contact with altered basic bodies or pegmatitic vein. Occurrences associated with pyroxene granulites and gneisses are also seen in some localities of the Wyra taluk. Similar Geological setups hosting corundum have been reported from the study area (Patil, 1973; Rao,1981; Narayan and Pavanaguru,2013). However, corundum crystals for the present study are obtained from placer concentrations seen to occur locally in the soil profile.

Samples of gem variety as well as abrasive variety of corundum are collected from these areas and, 2 samples of contrasting qualities are selected for studies.


Samples collected from the study area are analyzed based on its visual appearance and it has been grouped on that basis. Two Corundum  samples are sorted from them based on the colour and gemological quality so that, one sample is of abrasive quality with colourless nature ( C1, Fig.1) where  as the other one is of semi precious variety with pinkish red colour (C2, Fig.2).

Both the samples C1 and C2 after preliminary cleaning and acid treatment were cut into suitable size and then subjected to the following analyses namely, UV-Visible Spectroscopy,
Photoluminescence spectroscopy, FT-IR Spectroscopy, Raman Spectroscopy and EDXRF studies.
The spectra obtained for both the gem and abrasive variety samples using different advanced spectroscopic analyses are displayed with contrasting colours. The UV-Visible spectra
obtained for the samples in the wavelength range of 200 nm to 600 nm and Photoluminescence peaks in the wavelength range of 600 nm to 800 nm are shown in Figure.3 and Figure.4 respectively. Vibrational Spectroscopic studies on the samples using the Fourier Transform Infrared (FTIR) Spectroscopy and the Raman Spectroscopy are discussed
separately. Figure 5 and Figure 6 depicts the spectra obtained using FTIR Spectroscopy in a wavelength range between 4000 cm-1 to 500 cm-1 and Raman Spectroscopy in Raman
shifts ranging from 200 cm-1 to 800 cm-1, respectively. Results obtained from EDXRF Studies are discussed and correlated with the observations made from other Spectroscopic
techniques used in the research.

UV-Visible and Photoluminescence

The UV-Visible spectra of the two samples are observed in the wavelength range of 200 to 600 nm (Figure.3). The spectra show significant difference in the peaks obtained at certain wavelengths. The peaks shown by the C2 sample are of more intensity and magnitude compared to that of C1 sample, indicating the presence of certain additional elements in C2, which has favored in imparting pinkish red colour. Peaks in the range of 200 to 250 nm are more densely spaced in the C1 variety of corundum sample. A prominent peak at 241 nm is seen in C1. The hydroxylated ions present in samples correspond to absorptions in this wavelength. Such ions are hence present in higher concentration in the C1 variety.

Correlation of the absorbance peaks clearly shows a contrast in the peaks at wavelengths corresponding to Fe and Cr, the usual colour causing ions in ruby variety of corundum. Some of the studies (Nassau et al.,1983; Jatin and Pratima,2015) has shown that, the wavelengths that are usually absorbed by Fe ions  falls under the range of 380 to 400 nm whereas, peaks are observed to be present at 401, 461, 467, 475 and 535 nm when the Cr ions shows its prominence .

In the absorbance spectra of the samples, C1 is having peaks of very minute magnitude in the wavelength range corresponding to Fe ions and it doesn't shows any absorbance in the range of Cr ions. It is identified that, the peaks in this range, corresponding to Fe and Cr are present in C2 with a comparatively appreciable magnitude, which justifies the cause of colour in the C2 sample compared to C1.

The Luminescence peaks are observed for both of the samples in an excited state at 401 nm           (Figure.4). Luminescence peaks lies in the wavelength range between 600 to 800 nm. The dual peak at 692 and 694 represents the presence of Cr chromophores in both the samples (Nassau et al.,1983; Beran and Rossman et al.,2006; Jatin and Pratima,2015).  

Even though C1 sample has a significant peak at the above mentioned wavelengths, the magnitude is much lesser than that of C2. The very high magnitude of the peaks obtained for C2 samples substantiates its cause of colour due to prominent presence of Cr.

 FT-IR Spectroscopy

Fourier Transform Infrared Spectroscopy or FT-IR Spectroscopy data of the samples is observed (Figure.5) in a wavelength range between 4000 cm-1 to 500   cm-1. The spectra seen between 500 to 1000 cm-1 is of the same fashion with peaks at common wavelengths. Both the samples show peaks corresponding to same wavelengths, even though the C1 sample has a comparatively lesser magnitude. Therefore, these peaks are generally identified to be caused by the Alumina present in the crystal.

There are no considerable peaks seen in the C1 sample after 1000 cm1. Twin peaks observed in C2 sample at 1991 and 2100 cm1. Similar peaks are observed (Cowley,1969; Kloprogge et al.,2004; Jatin and Pratima,2015), indicating the presence of hydroxylated form of Alumina, corresponding to high temperature environment and the peaks seen in the wavelength range towards higher energy part is all corresponding to different hydroxylated ions in  the crystal lattice. These are caused by the vibration modes related with the bending and stretching of       –OH group bonds in the crystal lattice and the mineral groups that may be present cannot be always presumed to be due to the –OH association with Alumina groups. Such hydroxylated groups are similarly observed (Beran and Rossman,2006; Kloprogge et al., 2004)  to be due to the presence of other elements like Ti, Fe or V present in the crystal lattice in traces .

Raman Spectroscopy

Raman spectroscopy is depended on the vibrational modes of the substances subjected to analysis. Corundum is reported to have 18 vibrational modes where 7 are Raman active, 6 are Infrared active while the rest are neither Raman nor Infrared active and unique vibrations for Corundum are usually observed at 378, 418, 432, 451, 578, 645 and 751 cm1 (Porto and Krishnan,1967;XU J-A et al., 1995; Jasinevicius, 2009).

Individual spectra of both the samples C1 and C2 are well observed (Figure.6). The spectra obtained for C1 sample is devoid of any considerable peaks and is almost following a plain linear fashion.

In contrary, the spectra of C2 sample is showing a notable peak at 417 cm-1,a minute peak at  750 cm1 and a very minute one at 577 cm-1.

These peaks correspond to the typical fundamental vibrations evidenced in corundum, which are also believed to be associated with Alumina.

Geochemical Analysis

Characterization of the two variety of corundum in terms of chemical composition is highly essential in determining the cause of colour and other allied properties in Gemological perspective. The average weight percentage in terms of oxides of Al, Ca, Ti, V, Cr, Fe, Ga and Zr are obtained from the Energy Dispersive X Ray Fluorescence (EDXRF) Spectroscopy.

The presence of other oxides in the C1 samples is estimated to be within 0.8 weight percentage and the crystal is mere corundum with higher content of Al203 alone, even though 0.3 weight percentage of Fe2O3 is also observed. The  C2 sample shows 95.3 weight percentage of Al203 while other oxides constitutes for an average weight percentage of 3.179 out of which,Cr2O3 predominates with 1.882 by weight percentage followed by, TiO2, CaO and ZrO2.


Present study indicates subtle differences in the two samples. The UV-Visible spectra shows continuous peaks in the wavelength range from 401 to 535 in the C2 sample, while it remains absent in that of C1, revealing the predominance of Cr ions in C2 sample. The emission spectra due to Photoluminescence, has prominent dual peaks in the wavelengths 692 and 694nm in C2 sample while these peaks are present in a very less magnitude in the C1 sample. This accounts to the prominence of Cr chromospheres in C2 sample. Peaks obtained from the FTIR spectra, in the higher energy level prior to 1000cm-1,  throws light on the existence of several hydroxylated ions in the crystal, along with Alumina in the C2 sample while, peaks in this range remains absent in C1. The Raman spectra shows peaks at the typical fundamental vibrational modes corresponding to their respective Raman Shifts cm1 at 417, 750 and 577, in the C2 sample, while C1 sample is showing a spectra devoid of such peaks. EDXRF data substantiated the results obtained from other advanced spectroscopic analyses as it confirms that the presence of Cr2O3 and TiO2, which are desirable constituents of quality rubies is predominant in C2 sample, while, the quantity of Fe2O3 is higher in C1.

This study has been proven helpful in characterizing and determining the parameters and features present in the two varieties of samples collected from the study area, that are responsible for causing colour in them.


The authors are thankful to the Chairperson, Department of Geology, Bangalore University, Bangalore, for providing research facilities. We are grateful to Dr. M.D. Sastry, Head, R and D and Shri.K.T. Ramachandran, Chief Gemologist and Executive Secretary, of the Gemological Institute of India, Mumbai, for extending facilities for carrying the advanced spectroscopic analyses at their R and D Laboratory.



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A Study by K. Krupashree et. al. entitled "Protective Effects of Picrorhizakurroa Against Fumonisin B1 Induced Hepatotoxicity in Mice" is awarded best article for issue Vol 10 issue 20
A study by Mithun K.P. et al "Larvicidal Activity of Crude Solanum Nigrum Leaf and Berries Extract Against Dengue Vector-Aedesaegypti" is awarded Best Article for Vol 10 issue 14 of IJCRR
A study by Asha Menon "Women in Child Care and Early Education: Truly Nontraditional Work" is awarded Best Article for Vol 10 issue 13
A study by Deep J. M. "Prevalence of Molar-Incisor Hypomineralization in 7-13 Years Old Children of Biratnagar, Nepal: A Cross Sectional Study" is awarded Best Article for Vol 10 issue 11 of IJCRR
A review by Chitra et al to analyse relation between Obesity and Type 2 diabetes is awarded 'Best Article' for Vol 10 issue 10 by IJCRR. 
A study by Karanpreet et al "Pregnancy Induced Hypertension: A Study on Its Multisystem Involvement" is given Best Paper Award for Vol 10 issue 09

List of Awardees

A Study by Ese Anibor et al. "Evaluation of Temporomandibular Joint Disorders Among Delta State University Students in Abraka, Nigeria" from Vol 13 issue 16 received Emerging Researcher Award

A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" from Vol 13 issue 06 received Emerging Researcher Award

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Disclaimer: International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal.


International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal


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