Formula: Cu5 (As1.8 P.2) O12 H4
Name: Cornwallite
Unit cell: 4.6 5.757 17.38 90.0 91.87 90.0 , V=460.02
Space group: P121/C1 (14)

Arlt T , Armbruster T , Neues Jahrbuch fur Mineralogie, Monatshefte , 1999 (1999) p.468-480, Single-crystal X-ray structure refinement of cornwallite, Cu5(AsO4)2(OH)4:, A comparison with its polymorph cornubite and the (PO4)-analogue pseudomalachite, Locality: Clara mine, Oberwolfach, Black Forest, Germany, Note: Biso for O2 and O4 switched to match calculated values