Gahnite and columbite with compositions (Zn_5.96Fe_1.55Mg_0.21Mn_0.13)_Σ7.85Al_16.09O₃₂ and (Nb_7.36Ta_0.60Mn_2.95Fe_0.98Ti_0.09)_Σ11.98O₂₄ occur as accessory phases in a highly evolved garnetiferous muscovite alkalifeldspar granite. Both phases have developed as a result of a concentration of Zn, Nb, and Ta during the fmal stages of the fractional crystallization which led to the formation of the pluton, and the lack of a major mafic mineral such as biotite, in which these elements are normally camouflaged in granitoid rocks.