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      https://www.ias.ac.in/article/fulltext/boms/031/02/0155-0158

    • Keywords

       

      Glasses; infrared spectroscopy; fulgurites.

    • Abstract

       

      We report here for the first time the spectroscopic characterization of natural fulgurites of Garuamukh. On April 22, 2005 at 04 : 00 local time, large amounts of black-brown colour of colloidal solution came out from below the earth’s surface at Garuamukh near Nagaon town (latitude 26°20′39″N, longitude 92°41′39″E, Assam, India) with fire and smoke. This colloidal solution got transformed into fulgurites, glassy material, within a few hours. We present here the characterization of the fulgurites by Fourier transform infrared (FTIR) absorption, X-ray diffraction and X-ray fluorescence methods. The amorphous nature of the substance has been confirmed by Fourier transform infrared spectra of the fulgurites, which exhibit prominent absorption band in the region 400–1200 cm-1, the basic component of amorphous silica. The present study might have significant implications in understanding the thermodynamic properties of naturally occurring glasses, which are formed by shock metamorphism.

    • Author Affiliations

       

      B J Saikia1 G Parthasarathy2 N C Sarmah1 G D Baruah1

      1. Department of Physics, Dibrugarh University, Dibrugarh 786 004, India
      2. National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, India
    • Dates

       
  • Bulletin of Materials Science | News

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