Citation: Mellini, M.; Merlino, S. (1977). Hellandite: a new type of silicoborate chain. American Mineralogist, 62, pp. 89-99.
Formula: Al1.1 B8 Ca5.24 Fe0.9 H8 La2.62 O48 Si8 Y2.62
Chemical name: Ca5.24 (Y2.62 La2.62) (Al1.1 Fe0.9) (O H)4 (Si8 B8 O40 (O H)4)
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al2 B8 Ca8 Fe2 H4 La12 O48 Si8 Y12 (Al B4 Ca4 Fe H2 La6 O24 Si4 Y6)
Multiplicity: 1