Instituto de Investigaciones en Materials UNAM

A new occurrence of axinite and its chemical composition is reported. A three-dimensional X-ray di-ffraction structure analysis was carried out using 3124 observed structure amplitudes. The refnement converged to R: 0.019, wR: 0.030. The Mg2*, Mn2*, and Fe2 * ions occupy the distorted "Fe " octahedral site; the bond distances and angles are essentially unchanged from tlose reported by Takduchi et al. (1974). The crystal chemistry and structure of axinites have received extensive attention, and correlations have been derived between their physical properties and chemical composition [Lumpkin and Ribbe (1979), Takduchi et al. (1974)1. Axinite has not been previously reported from Mexico, and we describe such a location, the crystal structure of the mineral, and comment on its cation distribution. The location is in the Vinagrillos hills about 8 k