The Raman spectrum of holmquistite, a Li-containing orthorhombic amphibole from Bessemer City, USA has been measured. The OH-stretching region is characterized by bands at 3661, 3646, 3634 and 3614 cm−1assigned to 3 Mg–OH, 2 Mg +Fe2+–OH, Mg + 2Fe2+–OH and 3 Fe2+–OH, respectively. These Mg and Fe2+cations are located at theM1andM3sites and have a Fe2+/(Fe2++ Mg) ratio of 0.35. The 960–1110 cm−1region represents the antisymmetric Si–O–Si and O–Si–O stretching vibrations. For holmquistite, strong bands are observed around 1022 and 1085 cm−1with a shoulder at 1127 cm−1and minor bands at 1045 and 1102 cm−1. In the region 650–800 cm−1bands are observed at 679, 753 and 791 cm−1with a minor band around 694 cm−1attributed to the symmetrical Si–O–Si and Si–O vibrations. The region below 625 cm−1is characterized by 14 vibrations related to the deformation modes of the silicate double chain and vibrations involving Mg, Fe, Al and Li in the variousMsites. The 502 cm−1band is a Li–O deformation mode while the 456, 551 and 565 cm−1bands are Al–O deformation modes.
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