This exceptional 25mm x 26mm x 26mm cluster of fishtail twinned marcasite crystals hails from the famed European locality of Cap Blanc-Nez, Pas-de-Calais, France—a site long celebrated for producing some of the world's finest marcasite specimens.

Fully terminated and sharply defined, this piece exhibits classic fishtail twin morphology with a beautifully symmetrical formation. The crystals are sharply formed with brilliant metallic luster, giving the cluster a striking, mirror-like appearance under light.

A true high-grade specimen, this is a standout from a highly sought-after locality and would be a prized addition to any fine mineral collection. Pieces of this caliber from Cap Blanc-Nez are rare and becoming increasingly difficult to source.