Na(CaNa)(Fe2+3Al2)(Al2Si6O22)(OH)2
The taramite group minerals are sodium-calcium amphiboles defined with A(Na+K+2Ca)> 0.5 apfu and 1.5 apfu < C(Al+Fe3++2Ti).
Ferro-taramite is defined with
A position: Na dominant
C2+ position: Fe dominant
C3+ position: Al dominant
W position: (OH) dominant
