The rocks composing Piz Bernina are diorites and gabbros, while the massif in general is composed of granites (Piz Corvatsch, Piz Palü).
Piz Berninat moodustavad kivimid on dioriidid ja gabrod, samas massiiv üldiselt koosneb graniitidest (Piz Corvatsch, Piz Palü).