Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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X-Ray Powder Diffractometry and Electron Microprobe Study of Partially Disordered Wodginites from Challanpara Pegmatite, Bastar District, Chattisgarh


Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad - 500 016, India
     

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The wodginite group of minerals occur in the Challanpara pegmatite, Bastar District, Chattisgarh. Nearly pure wodginite fractions were obtained by heavy liquid and electromagnetic separation. The mineral fractions havc been studied by X-ray powder diffractometiy and electron-microprobe analysis. Challanpara wodginite deviates from ideal formula MnSnTa208, or ABC2O8 by extensive substitutions at the B site. The Challanpara wodginites also host small hut significant amounts of Zr, W and traces of U. X-ray diffraction study indicates that these wodginites show partial cation disorder.. Upon heating the samples to ∼950°C, cell parameters such as interaxial angle P and cell volume showed notable changes suggesting partial ordering of the crystal structure. 'The calculated index of order (Δ) varies in a narrow range from 0.40 to 0.41 suggesting that the examined phases are "partially disordered wodginites".

Keywords

Wodginite, Pegmatite, X-Ray diffraction, Electron microprobe, Challanpara, Bastar, Chattisgarh.
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  • X-Ray Powder Diffractometry and Electron Microprobe Study of Partially Disordered Wodginites from Challanpara Pegmatite, Bastar District, Chattisgarh

Abstract Views: 220  |  PDF Views: 2

Authors

E. V. S. S. K. Babu
Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad - 500 016, India
O. P. Somani
Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad - 500 016, India
R. Viswanathan
Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad - 500 016, India
R. P. Sinha
Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Begumpet, Hyderabad - 500 016, India

Abstract


The wodginite group of minerals occur in the Challanpara pegmatite, Bastar District, Chattisgarh. Nearly pure wodginite fractions were obtained by heavy liquid and electromagnetic separation. The mineral fractions havc been studied by X-ray powder diffractometiy and electron-microprobe analysis. Challanpara wodginite deviates from ideal formula MnSnTa208, or ABC2O8 by extensive substitutions at the B site. The Challanpara wodginites also host small hut significant amounts of Zr, W and traces of U. X-ray diffraction study indicates that these wodginites show partial cation disorder.. Upon heating the samples to ∼950°C, cell parameters such as interaxial angle P and cell volume showed notable changes suggesting partial ordering of the crystal structure. 'The calculated index of order (Δ) varies in a narrow range from 0.40 to 0.41 suggesting that the examined phases are "partially disordered wodginites".

Keywords


Wodginite, Pegmatite, X-Ray diffraction, Electron microprobe, Challanpara, Bastar, Chattisgarh.