MINING ROCKSTAR OF THE WEEK – MARCASITE!!
Marcasite is a yellow to silvery-yellow iron sulphide mineral with a chemical composition of FeS2. It forms by precipitation from acidic waters in surface or near-surface environments. Marcasite is commonly found in sediments, sedimentary rocks, and hydrothermal deposits in many parts of the world. Marcasite has historically been used as a source of sulphur; however, today it does not have any significant industrial use. Marcasite is similar to pyrite in appearance and physical properties, and it has the same chemical composition. However, the two minerals differ in crystal structure. Pyrite crystallizes in the isometric system, while marcasite is orthorhombic - "Geology.com".