migmatitic gneiss migmatite rock bands pattern, grey light dark banded granite texture macro closeup, large detailed textured

amphibole background banded bands biotite blocks closeup coarse composition cratonic crystals dark detailed diatexite dikelets eroded feldspar foliated foliation gneiss gneissic gneissose grained granite granitic gray grey horizontal igneous large leucosomes light macro material melanosomes melt melted melting mesosomes metamorphic metamorphism mica migmatite migmatites migmatitic minerals mixture molten mountain pattern precambrian prograde protolith ptygmatic quartz recrystallized rock rocks segregations silver structure texture textured unmelted veins