Citation: Miyawaki, R.; Momma, K.; Yokoyama, K.; Shigeoka, M.; Matsubara, S.; Ito, M.; Nakai, I.; Kristiansen, R. (2015). Mn-bearing hellandite-(Y) from the Heftetjern pegmatite, Tordal, Norway. The Canadian Mineralogist, 53, pp. 345-356.
Formula: Al0.92 B4 Ca1.582 Fe0.08 H2 Mn0.88 O24 Si4 Y2.752 Yb0.386
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al2 B8 Ca8 Fe2 H4 Mn4 O48 Si8 Y8 Yb8 (Al B4 Ca4 Fe H2 Mn2 O24 Si4 Y4 Yb4)
Multiplicity: 1