Citation: Mellini, M.; Merlino, S. (1977). Hellandite: a new type of silicoborate chain. American Mineralogist, 62, pp. 89-99.
Formula: Al0.55 B4 Ca2.616 Fe0.45 H2 O24 Si4 Y2.622
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al2 B8 Ca8 Fe2 H4 O48 Si8 Y12 (Al B4 Ca4 Fe H2 O24 Si4 Y6)
Multiplicity: 1