Citation: Armbruster, T.; Oberhansli, R. (1988). Crystal chemistry of double-ring silicates: Structures of sugilite and brannockite Note: x-coordinate of Na has been corrected. American Mineralogist, 73, pp. 595-600.
Formula: Al0.34 Fe1.66 K Li3 Na1.96 O30 Si12
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al4 Fe4 O60 Si24 (Al Fe O15 Si6)
Multiplicity: 1