Inequigranular, locally abundant potassic feldspar and garnet; interlayered and gradational with calc-silicate rock, sillimanite-mica schist, mica schist, and amphibolite. Contains small masses of granitic rock.
Garnet, staurolite, kyanite, or sillimanite occur locally; lenses and layers of quartz schist, micaceous quartzite, calc-silicate rock, biotite gneiss, amphibolite, and phyllite.
Massive to weakly foliated; contains pegmatites, lithium-bearing on east side.
Equigranular to megacrystic, foliated to massive. Includes Toluca Granite.
Sericite schist, locally with graphite, phyllite with sericite quartzite, banded marble, amphibolite, and minor calc-silicate rock.
Quartz-sericite schist with metavolcanic rock, quartz-pebble metaconglomerate, kyanite-sillimanite quartzite, and garnet-quartz rock.
Foliated to massive.
Layered biotite-quartz-feldspar gneiss
Thin to thick layered sillimanite-mica schist and sillimanite-bearing muscovite-biotite schist