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      https://www.ias.ac.in/article/fulltext/boms/031/05/0775-0779

    • Keywords

       

      Quartz; crystallinity; infrared spectroscopy; structure elucidation.

    • Abstract

       

      We present here optical properties and crystallinity index of quartz (SiO2) in natural rocks samples from the Mikir and Khasi hills, Assam, India. Infrared spectroscopy has been used to study the structure of quartz in rock samples and estimate the mining quality of quartz mineral, which is substantiated by calculating the crystallinity index. Systematic investigations of structure have been carried out in between 10 𝜇m (1000 cm–1) and 20 𝜇m (500 cm–1) bands of silicates. Investigation is based on the assignment of infrared bands to certain structural groups of SiO4 tetrahedra. The crystallinity of samples has been ascertained by comparing the ratio of intensity of the characteristic peak at 778 and 695 cm–1 with the corresponding ratio for a standard sample. The crystallinity parameter is calculated by using a standard procedure which can be used to estimate the distribution of quartz in various rocks for mining purpose. The infrared spectroscopic investigation is found to be an ideal tool for structure elucidation and for estimating quartz crystallinity of the natural samples.

    • Author Affiliations

       

      Bhaskar J Saikia1 G Parthasarathy2 N C Sarmah1

      1. Department of Physics, Dibrugarh University, Dibrugarh 786 004, India
      2. National Geophysical Research Institute, Council of Scientific and Industrial Research, Hyderabad 500 007, India

    • Dates

       
      Published
      October 2008
      Manuscript received
      23 April 2008

  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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