Citation: Tartarotti, P.; Caucia, F. (1993). Coexisting cummingtonite - sodic amphibole pair in metaquartzites from the ophiolite's sedimentary cover (St. Marcel Valley, Italian Western Alps): A X-ray structure refinement and petrology study. Neues Jahrbuch fuer Mineralogie. Abhandlungen (Band-Nr) (1950-), 165, pp. 223-243.
Formula: Fe3.58 H2 Mg3.36 Na0.06 O24 Si8
Chemical name:(Fe3.58 Mg3.36 Na.06) (Si8 O22 (O H)2)