From Figure 9 of  Diella et al, 2018
Rossmanite occurs in the central pink area.

In the Adamé valley, gem-quality tourmaline occurs in multi-coloured elongated crystals up to 7 cm in length in the miarolitic pegmatite cavities hosted in contact with metamorphic sandstones that belonging to a Permian-Mesozoic sedimentary sequence.  The tourmalines in the study were principally fluor-elbaite, along with minor amounts of fluor-liddicoatite, foitite and rossmanite that likely represented the final stages of the evolution of tourmaline compositions in the pegmatites.