The isobaric heat capacity of monocrystalline Ca2GeO4 (olivine structure) has been measured between T = (6 and 350) K by precision adiabatic vacuum calorimetry for the first time. The experimental results have been used to calculate the standard (p(o) = 0.1 MPa) thermodynamic functions C-p,m(o)/R, Delta H-T(6)m(o)/RT, Delta S-T(6)m(o)/R and Phi(o)(m)/R = Delta S-T(6)m(o)/R= Delta H-T(6)m(o)/RT (where R is the universal gas constant) of Ca2GeO4 (cr) over the range from T = (6 to 350) K. The thermal expansion coefficient (alpha) of this synthetic mineral has been determined from low-temperature X-ray measurements over the range from T = (100 to 300) K. Isochoric heat capacity C-v,C-m/R has been calculated using this low-temperature X-ray measurements and available compressibility data. The "acoustical" and "optical" components of the isochoric heat capacity have been estimated. The "optical" component of the one are calculated from the vibrational frequencies (v) as measured by Raman spectroscopy with different polarization at room temperature and at 1 bar. (C) 2014 Elsevier Ltd. All rights reserved.