Marcasite is a metallic mineral closely related to pyrite, known for its brassy-yellow hue and sparkling, faceted crystals that catch the light beautifully. Commonly forming in sedimentary rocks, it has been used historically in jewellery and amulets. Folk lore regarded marcasite as a protective talisman, believed to ward off negative energies and bring good fortune. Metaphysically, it is said to enhance clarity, focus, and mental agility, while encouraging courage and resilience, making it a captivating choice for collectors and spiritual enthusiasts alike.