Miarolitic granitic pegmatites in the Stak valley in the northeast part of the Nanga Parbat – Haramosh Massif, in northern Pakistan, locally contain economic quantities of bi- and tricolored tourmaline.
Ref.:
Laurs, B. M., Dilles, John H., Wairrach, Y., Kausar, A. B. & Snee, L. W. (1998): Geological setting and petrogenesis of symmetrically zoned, miarolitic granitic pegmatites at Stak Nala, Nanga Parbat-Haramosh Massif, northern Pakistan. Canadian Mineralogist 36, 1-47.
