Figure 4. Mineral microstructures. A. Garnet displaying different growth stages. Plane-polarized light (interval 161-976E-14R-1 [Piece 3B, 40-45 cm]). B. Garnet partially replaced by biotite, giving an atoll-like microstructure. Plane-polarized light (interval 161-976E-14R-3 [Piece 1A, 10-14 cm]). C. Garnet growing mimetically on a D1 fold. Plane-polarized light (interval 161-976E-14R-3 [Piece 1A, 10-14 cm]). D. Garnet overgrowing sillimanite in a high-grade gneiss. Plane-polarized light (interval 161-976B-97R-2 [Piece 18, 114-115 cm]). E. Plagioclases with inclusion-rich core and inclusion-poor rim. Prismatic sillimanite is enclosed within plagioclase and staurolite. Plane-polarized light (interval 161-976E-14R-1 [Piece 3B, 40-45 cm]).

Figure 4. Mineral microstructures. A. Garnet displaying different growth stages. Plane-polarized light (interval 161-976E-14R-1 [Piece 3B, 40-45 cm]). B. Garnet partially replaced by biotite, giving an atoll-like microstructure. Plane-polarized light (interval 161-976E-14R-3 [Piece 1A, 10-14 cm]). C. Garnet growing mimetically on a D₁ fold. Plane-polarized light (interval 161-976E-14R-3 [Piece 1A, 10-14 cm]). D. Garnet overgrowing sillimanite in a high-grade gneiss. Plane-polarized light (interval 161-976B-97R-2 [Piece 18, 114-115 cm]). E. Plagioclases with inclusion-rich core and inclusion-poor rim. Prismatic sillimanite is enclosed within plagioclase and staurolite. Plane-polarized light (interval 161-976E-14R-1 [Piece 3B, 40-45 cm]).