Pure clay mineral fractions (<500 nm) was obtained from of Velay Green clay by decarbonation and subsequent size fractionation using centrifugation with the aim of understanding the intrinsic properties of these extracts from rich volcanic earth containing iron. It was found confirmed that the Velay Green clay was mainly composed of illite and kaolinite clay minerals which wereand contained iron rich. Mossbauer studies revealed the presence of Fe (III) in the lattice sites of both the clay minerals. Therefore, electrochemical characterization was performed in the presence of methylene blue and methyl viologen redox mediators in order to understand evidence the accessibility of iron in the clay structure. Further, Fenton-like reaction on degradation of methylene blue was observed performed in the presence of the clay fraction and H2O2 evidencing that effectively confirmed that the iron in the clay fraction exhibits catalytic activity. The influence of the initial pH, temperature, H2O2 concentration, time of reaction and clay amount was investigated. Sheet is 210 mm x 297 mm, with top margin of 41 mm, bottom margin of 25 mm, left and right margins of 25 mm. Abstract should not exceed one page. Title should be centred with Times New Roman font in 13-point, boldface type, capital letter.