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Systematically twinned olivenite (Cu 2 (AsO 4 )OH) single crystals from Cap Garonne, Mine du Pradet, France, were studied by X-ray diffraction:  P  2 1 / n ,  a  = 822.69(6) pm,  b  = 861.88(9) pm,  c  = 594.06(9) pm,  β  = 90.000(6)°,  wR  = 0.0224, 1621F    2  values, 79 variables and a domain ratio of 0.501(1)/0.499(1). The temperature dependence of the magnetic susceptibility was well reproduced with a square-spin cluster model and an antiferromagnetic spin-exchange parameter of  J / k  B  = 157(3) K.

Twinned olivenite from Cap Garonne, Mine du Pradet – structure and magnetic behavior