Rossmanite occurs as pink crystals in the pegmatite. It forms in the late stages of crystallization.
Composition:
The compositions of individual analyses in the rossmanite field are indicated by the following diagram:
Reference:
Selway JB, Novák M, Cerný P, Hawthorne FC. (2000) Compositional evolution of tourmaline in lepidolite-subtype pegmatites. European Journal of Mineralogy, 11, 569-584.