One of the goals of the Bureau of Mines is to provide thermodynamic quantities for minerals and related inorganic compounds. As part of this effort, the molar heat capacity of Al4SiC4 was measured by the Bureau from 5.26 to 301.5 K by adiabatic calorimetry and from 347 to 1,047 k by differential scanning calorimetry. The values at t = 298.15 K for cp,m, sm(t)-sm(o) , - gm(t)-hm(0) /t, and hm(t)- hm(0) are 145.07, 107.62, 40.66 J.K-1.Mol-1, and 19.96 Kj.Mol-1, respectively. These properties are also reported from 5 to 2,000 k at convenient temperature intervals. The standard molar enthalpy of formation afhm(Al4SiC4), calculated from Behrens and Rinehart's Knudson-effusion mass-spectrometric results, is -(203.3+/-4.9)Kj.Mol- 1 at 298.15 K.