Synchrotron radiation provides the necessary spatial and temporal resolution for non‐invasive operando studies of dynamic processes under complex environmental conditions. Here a new environmental cell for simultaneous in situ dynamic X‐ray imaging and measuring acoustic properties of geological samples is presented. The primary purpose of this cell is to study gas‐hydrate formation in porous geo‐materials and its influence on their acoustic properties. The cell is designed for cylindrical samples of 9 mm in diameter, confining and pore pressures up to 12 MPa, and temperatures from −20°C to room temperature. The cell is portable and can be easily assembled and operated at different X‐ray sources. This cell enables a wide range of experiments studying physical/chemical processes in the Earth subsurface that change the mechanical properties of rocks (geochemical reactions, phase transitions, etc.). A new environmental cell for simultaneous in situ dynamic X‐ray imaging and measuring acoustic properties of geological samples is presented. The cell helps studying physical/chemical processes in geomaterials and their influence on the mechanical properties.