Citation: Griffen, D. T. (1988). Howlite, Ca2SiB5O9(OH)5: Structure refinement and hydrogen bonding. American Mineralogist, 73, pp. 1138-1144.
Formula: B5 Ca2 H5 O14 Si
List type: noninterleaving
List: 2D
Basis: (0;1;0 0;0;1)
Dimensionality: 2
Formula: B20 H20 O56 Si4 (B5 H5 O14 Si)
Multiplicity: 1