 Spectral lines of calcium (Ca I, Ca II) and sodium (Na), expected for a Mercury-like planet, are either absent or below detection limits, and even emission lines expected from volcanic activity, due to tidal forces exerted by the gravity of the nearby star, were not found.The lack of detections is in agreement with the previously cited theoretical work, which points to a cloudless atmosphere made of rocky vapours with a very low pressure.From the data available, scientists can only infer that CoRoT-7b does not resemble any of the rocky planets of the Solar System.