AM_Sturmanite Formula: Fe.59 Ca6 S2.24 B1.09 O49.92 Name: Sturmanite Unit cell: 11.188 11.188 21.91 90.0 90.0 120.0 , V=2375.08 Space group: P31C (159)

Pushcharovsky D Y , Lebedeva Y S , Zubkova N V , Pasero M , Bellezza M , Merlino S , Chukanov N V , The Canadian Mineralogist , 42 (2004) p.723-729, The crystal structure of sturmanite, Locality: Black Rock mine, Kuruman District, Kalahari manganese field, North Cape province, South Africa