Electron microprobe data for Serpentine, Spinel and carbonate (magnesite and dolomite) for 11 samples from Hole BT1B, Oman Drilling project. The discussion of the data is available in the paper "Petrological study of listvenite series drilled at OmanDP Hole BT1B: Thermodynamic constraints on metasomatic sequences in the mantle atop the basal thrust of the Semail ophiolite" submitted to the Journal of Geophysical Research, special collection "Ophiolites and Oceanic Lithosphere, with a focus on the Samail ophiolite in Oman".