10 000 Francs CFA Black Ammonite

Burkina Faso's authority to issue commemorative coinage derives from its membership in the West African Economic and Monetary Union, which pools monetary policy under the BCEAO — meaning these large-format collector pieces are authorized politically but exist entirely outside the currency's functional circulation. The black ammonite specimen type this coin references comes primarily from deposits in Morocco and Madagascar, where the iridescent shell material, often sold under the trade name "ammolite," has been commercially exploited since the 1980s.

At a kilogram of fine silver, this is unambiguously a bullion-adjacent collector piece, likely with mintage in the low hundreds.