Publications with shared reference: Raman spectroscopic study of the tellurite minerals: emmonsite Fe<sub>2</sub><sup>3+</sup>Te<sub>3</sub><sup>4+</sup>O<sub>9</sub>·2H<sub>2</sub>O and zemannite Mg<sub>0.5</sub>[Zn<sup>2+</sup>Fe<sup>3+</sup>(TeO<sub>3</sub>)<sub>3</sub>]4.5H<sub>2</sub>O