Marcasite - Cap Blanc-Nez, Pas-de-Calais, France - Height: 5.5 cm - Width: 2.8 cm- 68 g

Marcasite is an iron sulfide mineral closely related to pyrite, but distinguished by its orthorhombic crystal structure. The specimen from Cap Blanc-Nez, Pas-de-Calais, France, illustrates well-formed marcasite crystals, often recognized by their pale brass-yellow color and metallic luster. Marcasite has been used historically in jewelry and ornamental objects, especially in vintage pieces where its bright shine adds distinctive appeal. However, marcasite can degrade over time through weathering, which collectors must consider when preserving specimens. The locality in France is known for producing attractive specimens, contributing to the mineral's appeal for collectors interested in European mineralogy.