AM_Dioptase_1
Formula: Cu Si O4 H2
Name: Dioptase
Unit cell: 8.819 8.819 8.819 111.7 111.7 111.7 , V=479.52
Space group: R-3 (148)

Belokoneva E L , Gubina Y K , Forsyth J B , Brown P J , Physics and Chemistry of Minerals , 29 (2002) p.430-438, The charge-density distribution, its multipole refinement and the, antiferromagnetic structure of dioptase, Cu6[Si6O18].6H2O