AM_Dioptase Formula: Cu Si O4 H2 Name: Dioptase Unit cell: 14.566 14.566 7.778 90.0 90.0 120.0 , V=1429.15 Space group: R11-3 (1)

Ribbe P H , Gibbs G V , Hamil M , American Mineralogist , 62 (1977) p.807-811, A refinement of the structure of dioptase, Cu6[Si6O18]*6H2O, Note: sample is from Reneville, Congo