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Chemistry, Raman and infrared spectroscopic characterization of the phosphate mineral reddingite: (MnFe)3(PO4)2(H2O,OH)3, a mineral found in lithium-bearing pegmatite

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Abstract

Detailed investigation of an intermediate member of the reddingite–phosphoferrite series, using infrared and Raman spectroscopy, scanning electron microcopy and electron microprobe analysis, has been carried out on a homogeneous sample from a lithium-bearing pegmatite named Cigana mine, near Conselheiro Pena, Minas Gerais, Brazil. The determined formula is \( ({\text{Mn}}_{1.60} {\text{Fe}}_{1.21} {\text{Ca}}_{0.01} {\text{Mg}}_{0.01} )_{\sum 2.83} ({\text{PO}}_{4} )_{2.12} \cdot ({\text{H}}_{2} {\text{O}}_{2.85} {\text{F}}_{0.01} )_{\sum 2.86} \), indicating predominance in the reddingite member. Raman spectroscopy coupled with infrared spectroscopy supports the concept of phosphate, hydrogen phosphate and dihydrogen phosphate units in the structure of reddingite-phosphoferrite. Infrared and Raman bands attributed to water and hydroxyl stretching modes are identified. Vibrational spectroscopy adds useful information to the molecular structure of reddingite–phosphoferrite.

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Acknowledgments

The financial and infrastructure support of the Discipline of Nanotechnology and Molecular Science, Science and Engineering Faculty of the Queensland University of Technology is gratefully acknowledged. The Australian Research Council (ARC) is thanked for funding the instrumentation. We also gratefully acknowledge the contributions of the Fundação de Amparo à Pesquisa do Estado de Minas Gerais—FAPEMIG—grant No. CRA—APQ-03998-10.

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Authors and Affiliations

  1. Science and Engineering Faculty, School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, GPO Box 2434, Brisbane, QLD, 4001, Australia

    Ray L. Frost & Yunfei Xi

  2. Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG, 35400-00, Brazil

    Ricardo Scholz & Leonardo E. Lagoeiro

  3. Federal University of Itajubá, Campus Itabira, Itabira, MG, 35903-087, Brazil

    Fernanda M. Belotti

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  1. Ray L. Frost
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  2. Yunfei Xi
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  3. Ricardo Scholz
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  5. Leonardo E. Lagoeiro
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Correspondence to Ray L. Frost.

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Frost, R.L., Xi, Y., Scholz, R. et al. Chemistry, Raman and infrared spectroscopic characterization of the phosphate mineral reddingite: (MnFe)3(PO4)2(H2O,OH)3, a mineral found in lithium-bearing pegmatite. Phys Chem Minerals 39, 803–810 (2012). https://doi.org/10.1007/s00269-012-0535-7

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