Abstract
The crystal structure of antlerite has been worked out by means of the heavy atom method through the two-dimensional Patterson and Fourier syntheses. The lattice constants of the mineral are a0=8.23±0.02Å., b0=12.00±0.02Å. and c0=6.03±0.01Å. Its space group is Pnam, and there are four chemical units of composition Cu3(SO4)(OH)4.
The structure is composed of chains of octahedra formed by oxygen atoms and hydroxyl groups linked with copper atoms, and there are two types of non-equivalent copper atoms having different coordination.
