Abstract
ABSTRACTLüneburgite, a rare magnesium borate-phosphate mineral from Mejillones, Chile, has been characterized using Raman and mid-infrared spectroscopy methods. Boron tetrahedra are characterized by sharp Raman band at 877 cm−1, attributed to the ν1[BO4]5− symmetric stretching mode. The phosphate anion is associated with a distinct band at 1032 cm−1, attributed to the ν3[PO4]3− antisymmetric stretching mode. The most intensive Raman band at 734 cm−1 is ascribed to stretching vibrations of bridging oxygen atoms in boron–oxygen–phosphor bridges. Bonds associated with water bending mode and stretching vibration are observed at 1661 cm−1 (infrared) and in the 3000–3500 cm−1 region (Raman and infrared spectrum).
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