Abstract. The infrared absorption spectrum of a natural antigorite sample from New Caledonia is compared to its theoretical counterpart computed for the pristine m=17 polysome within density functional perturbation theory framework. model reproduces most bands related Si-O stretching in 800–1300 cm−1 range, OH libration, hindered translation and SiO4 bending 400–800 3500–3700 range. Most observ...