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Synchrotron radiation has allowed structure detn. by single-crystal methods using a flake of material 5 μm thick from a specimen of the natural mineral, Pima County Arizona. The crystals are monoclinic and twinned. As in the related mineral hydrozincite, Zn5(OH)6(CO3)2 [Ghose ,1964], there are double layers of close-packed O atoms, with metal atoms in octahedral holes, as well as tetrahedrally coordinated metal atoms. In contrast to hydrozincite, there are also five-coordinate metal atoms. Alternate layers are linked only by hydrogen bonds and the metal coordination octahedra show strong tetragonal distortion. The tetrahedral sites are probably occupied by zinc, the other sites by zinc and copper. [on SciFinder(R)]
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Harding et al. (1994) studied this question.
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