Citation: Hamada, M.; Akasaka, M.; Seto, S.; Makino, K. (2010). Crystal chemistry of chromian pumpellyite from Osayama, Okayama Prefecture, Japan Sample: ocp1013. American Mineralogist, 95, pp. 1294-1304.
Formula: Al1.99 Ca2 Cr0.46 Fe0.08 Mg0.45 Mn0.02 O14 Si3
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al12 Cr12 Fe4 Mg4 Mn4 O56 Si12 (Al3 Cr3 Fe Mg Mn O14 Si3)
Multiplicity: 1