Rhodonite is usually found in metamorphic rocks associated with other manganese minerals. It is also found in rocks that have been altered by contact metamorphism, hydrothermal and metasomatic processes. It is usually massive to granular in occurrence. Rarely, it is found as red triclinic crystals.
Rhodonite is an uncommon mineral. It is found in a few small deposits across the world. Sources of rhodonite include: Argentina, Australia, Brazil, Canada, England, India, Peru, Russia, and Sweden. In the United States it has been found in North Carolina, Colorado, New Jersey, and has been named as the state gem of Massachusetts.