Fluoro-potassic-pargasite, KCa₂(Mg₄Al)(Si₆Al₂)O₂₂F₂, from the Tranomaro area, Madagascar: mineral description and crystal chemistry

Fluoro-potassic-pargasite, KCa₂(Mg₄Al)(Si₆Al₂)O₂₂F₂, from the Tranomaro area, Madagascar: mineral description and crystal chemistry