Outstanding Rare Natural Baryte Pseudomorph Marcasite Specimen Statement Piece Collectors PieceOutstanding Rare Natural Baryte Pseudomorph Marcasite Specimen Statement Piece Collectors Piece Weight 0. 250kg Size 9cm by 9cm Thickness 7cm Baryte occurs as glittering concretions or crystals in nature, which are made up of the chemical barium sulphate, and can be found in colours like white, blue, light green, reddish brown or yellow. Marcasite is an Iron oxide that has the exact same chemical makeup of Pyrite, but forms in a completely different