Mineralogical note : the status of 'chillagite'

‘Chillagite,’ Pb(Mo,W)O4 with Mo W, from the Christmas Gift mine, Chillagoe, Queensland, was described as a new mineral nearly a century ago, but later workers concluded that it was merely a member of the solid-solution series extending between the end-members wulfenite, PbMoO4, and stolzite, PbWO4. This article re-examines the crystal structure of wulfenite to determine the status of ‘chillagite’.