Heinze, L.; Beltran-Rodriguez, R.; Bastien, G.; Wolter, A.; Reehuis, M.; Hoffmann, J.; Rule, K.; Süllow, S.: The magnetic properties of single-crystalline atacamite, Cu2Cl(OH)3. Physica B 536 (2018), p. 377-378
10.1016/j.physb.2017.09.073

Abstract:
We present susceptibility measurements on the natural mineral atacamite, Cu2Cl(OH)3, for the first time along the three crystallographic axes. Further, we have carried out an elastic neutron diffraction experiment which shows that the symmetry of the magnetic ground state of atacamite is described by a propagation vector q = (1/2 0 1/2).