Common occurrences of rock-forming garnets

almandine metamorphic rocks—especially mica schists, amphibolites, and granulites; granites, aplites, and granitic pegmatites

spessartine granitic pegmatites; silica-rich skarns; metamorphosed manganese-bearing rocks

grossular impure calcite and dolomite marbles, especially those in contact metamorphic zones; amphibolites; basic igneous rocks

andradite large masses associated with tactites, some of which constitute ore deposits, in calcareous rocks of contact metasomatic origin

pyrope ultramafic rocks such as pyroxenites and peridotites and serpentinites derived from them; eclogites (high-pressure metamorphic rocks)