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The crystal structure of cobalt-bearing adamite (Zn, Co) 2 AsO 4 OH (so-called cobalton adamite) from Mine du Pradet, Cap Garonne, France has been refined from single crystal X-ray diffraction data:  Pnnm ,  a  = 831.39(4),  b  = 852.67(6),  c  = 605.84(6) pm, w R  = 0.0568, 901  F   2  values, 48 variables. The composition of the single crystal and the bulk sample with EDX and ICP-OES was determined as Zn 1.94 Co 0.06 (AsO 4 )OH and (Co 0.085 Ni 0.037 Cu 0.270 Zn 1.608 )AsO 4 OH. The Co 2+ , Ni 2+  and Cu 2+  incorporation in the bulk sample leads to Curie paramagnetism with an experimental moment of 2.85 µ B / M   2+  cation and explains the pink color along with the greenish edges. The Raman spectrum shows the characteristic vibrations of the AsO 4  tetrahedra and the  M O 5  pyramids as well as the O–H stretching mode. The adamite structure is closely related with the olivenite type (space group  P 2 1 / n 11). This structural relationship is discussed on the basis of a group–subgroup scheme (Bärnighausen formalism).

Cobalt-bearing adamite from Cap Garonne, Mine du Pradet, France – structural relationship to olivenite and magnetic behavior