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<p>Three oxide minerals belonging to the columbite group, including columbite–(Mn) (MnNb<sub>2</sub>O<sub>6</sub>), columbite–(Fe) (FeNb<sub>2</sub>O<sub>6</sub>), and fersmite (CaNb<sub>2</sub>O<sub>6</sub>), were found in specimens from gem placers in Ratnapura district, Sri Lanka. We present results of chemical, structural and spectroscopic analyses, including the first Raman spectrum for natural fersmite. For columbite–(Mn) and columbite–(Fe), analytical results obtained before and after dry annealing in air indicate low degrees of accumulated self-irradiation damage, which corresponds well with low actinide concentrations.</p>

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Three columbite-group minerals from Ratnapura, Sri Lanka

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  • 发表日期：

    2025年6月1日

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  • K. A. Geeth Sameera,
  • Chutimun Chanmuang N.,
  • Radek Škoda,
  • Manfred Wildner,
  • Lutz Nasdala

摘要

Three oxide minerals belonging to the columbite group, including columbite–(Mn) (MnNb2O6), columbite–(Fe) (FeNb2O6), and fersmite (CaNb2O6), were found in specimens from gem placers in Ratnapura district, Sri Lanka. We present results of chemical, structural and spectroscopic analyses, including the first Raman spectrum for natural fersmite. For columbite–(Mn) and columbite–(Fe), analytical results obtained before and after dry annealing in air indicate low degrees of accumulated self-irradiation damage, which corresponds well with low actinide concentrations.