10 Francs Rhinoceros, rhodium

Rhodium is not minted into coins in any meaningful commercial tradition — it is a byproduct of platinum and palladium refining, produced in quantities so small that annual global output rarely exceeds 30 tonnes. Rwanda's National Bank issued this piece as part of a broader series of exotic-metal collector coins, a category driven almost entirely by novelty demand rather than monetary function. Rhodium's extreme hardness makes die wear a genuine concern at this scale.