Vibrational spectroscopic study of the copper silicate mineral ajoite (K,Na)Cu7AlSi9O24(OH)6·3H2O

► We have studied the molecular structure of the mineral ajoite (K,Na)Cu7AlSi9O24(OH)6·3H2O. ► Multiple ν4 SiO4 vibrational modes indicate strong distortion of the SiO4 tetrahedra. ► Ajoite is a native Indian healing mineral.