Citation: Guggenheim, S.; Bailey, S.W. (1978). Refinement of the margerite structure in the subgroup symmetry: correction, further refinement and comments. American Mineralogist, 63, pp. 186-187.
Formula: Al3.88 Ca0.88 H2 Na0.12 O12 Si2.12
Chemical name:(Ca0.88 Na0.12) Al2 (Si2.12 Al1.88 O10) (O H)2