Citation: Tait, K.; Ball, N. A.; Hawthorne, F. C. (2015). Pieczkaite, ideally Mn5(PO4)3Cl, a new apatite-supergroup mineral from Cross Lake, Manitoba, Canada: Description and crystal structure. American Mineralogist, 100, pp. 1047-1052.
Formula: Ca1.39 Cl0.72 Fe0.26 H0.28 Mn3.41 O12.28 P3
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Ca10 Cl4 Fe10 Mn10 O28 P6 (Ca5 Cl2 Fe5 Mn5 O14 P3)
Multiplicity: 1