Environmental conditions (temperature, pH, total dissolved sulphides, iron, and copper, and sampled surfaces on the hydrothermal edifice Eiffel Tower (Lucky Strike vent field, Mid-Atlantic Ridge), during Momareto cruise (2006). Twelve sampling units were selected to represent variate mussel assemblages on the edifice. Environmental conditions were measured above each of them. Details on the sampling method and biodiversity analysis are published in Sarrazin et al. 2015 (https://doi.org/10.1016/j.dsr2.2015.04.013)