The metamorphic units comprise garnet-glaucophane schist (lepi-doporphyroblastic texture), epidote-chlorite schist (lepidoblastic
texture), garnet-lawsonite-glaucophane schist and epidotite (nematoblastic texture) (Fig.
The San Lorenzo Schists are foliated, medium- to coarse-grained, pelitic rocks that generally show a millimeter-scale compositional banding consisting of alternation of lepidoblastic
muscovite-biotite domains and coarse-grained granoblastic quartz-rich microlithons.
Very fine-grained andalusite-bearing graphite slates of light to dark gray color and silky luster show a poor-developed schistose structure, lepidoblastic texture and slightly subparallel foliation.
They show lepidoblastic to granolepidoblastic textures, which are defined by the orientation of biotite and ilmenite.
They show a lepidoblastic to granolepidoblastic textures, which are defined by the alignment of muscovite.
Additionally, muscovite, chlorite, and graphite minerals define the lepidoblastic texture.
The lepidoblastic texture is also observed due to the orientation of mica minerals.