Crystal structure of larsenite PbZnSiO4

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Abstract
Larsenite is a rare mineral reported from Franklin, New Jersey. It is orthorhombic with a = 8.244 Å, b = 18.963 Å, c = 5.06 Å, Z = 8, space group Pna21, and is piezoelectric. The structure was determined using three-dimensional diffractometer data and was refined by least squares to an R of 0.055 for all reflections. It is a new type of structure composed of a network of corner-linked zinc and silicon tetrahedra and three-sided and distorted four-sided lead pyramids, respectively. The mean values of the cation-oxygen distances are Si–O, 1.63 Å; Zn–O, 1.95 Å; Pb(1)–O, 2.33 Å; and Pb(2)–O, 2.47 Å.

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