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.
Foliated to massive, granitic to quartz dioritic; biotite gneiss and amphibolite common.
Interlayered; minor layers and lenses of hornblende gneiss, metagabbro, mica schist, and granitic rock.
Monzonitic to granodioritic; inequigranular.
Equigranular to megacrystic, foliated to massive. Includes Toluca Granite.
Weakly foliated to massive, contains plagioclase megacrysts and, rarely, larger megacrysts of quartz and feldspar.
Massive to foliated, granodioritic, migmatitic.
Interlayered with amphibolite.
Poorly foliated; interlayered with biotite augen gneiss.
Equigranular to porphyritic, massive to well foliated; contains biotite and muscovite.
Layered biotite-quartz-feldspar gneiss
Poorly layered to massive; megacrysts of microcline and quartz; local mica schist, amphibolite, and biotite gneiss
Thin to thick layered sillimanite-mica schist and sillimanite-bearing muscovite-biotite schist