Figure 2

Representative microphotographs of granites under plane-polarized light (a,c) and hand specimens (b,d). (a) Aegirine–augite granite sample has a mineral assemblage of Kf + Ab + Bt + Qz + Agt; (c) arfvedsonite granite samples have a mineral assemblage of Qz + Kf + Bt + Mag + Arf + Ab. Abbreviations: Ab, albite; Agt, aegirine–augite; Arf, arfvedsonite; Bt, biotite; Kf, K-feldspar; Qz, quartz.