A Raman spectroscopic study of synthetic giniite

Intense Raman bands observed at 396, 346 and 234 cm−1are attributed to the FeO stretching vibrations. The giniite phosphate units are characterised by two Raman bands at 1023 and 948 cm−1 assigned to symmetric stretching mode of the (PO4)3− units. A complex band is observed at 460.5 cm−1 with additional components at 486.8 and 445.7 cm−1 attributed to the ν2 bending modes suggesting a reduction of symmetry of the (PO4)3− units.