Citation: Kastsvetaeva, R. K.; Aksenov, S. M.; Chukanov, N. V.; Menezes, L. A. D. (2014). Crystal structure of almeidaite, a new mineral of the crichtonite group. Doklady Chemistry, 455, pp. 53-57.
Formula: Fe4.9 H0.82 Mn0.8 O38 Pb0.6 Sr0.1 Ti13.4 Y0.4 Zn1.5
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Fe24 Mn21 O120 Ti54 Y3 Zn6 (Fe8 Mn7 O40 Ti18 Y Zn2)
Multiplicity: 1