Citation: Hawthorne, F.C.; Grundy, H.D. (1977). The crystal chemistry of the amphiboles. Refinement of the crystal structure of a sub-silicic hastingsite. Mineralogical Magazine (1969-), 41, pp. 43-50.
Formula: Al3.31 Ca1.74 Fe3 H1.44 K0.3 Mg1.17 Na0.82 O24 Si5.27 Ti0.39
Chemical name: Na0.82 K0.30 Ca1.74 (Mg1.17 Fe3.00 Ti0.39 Al0.58) Si5.27 Al2.73 O22.56 (O H)1.44
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Al20 Ca4 Fe14 Mg10 Na4 O48 Si16 Ti4 (Al10 Ca2 Fe7 Mg5 Na2 O24 Si8 Ti2)
Multiplicity: 1