Comparison of laboratory hot pressing measurements at fixed p and T (shown at the curves) for San Carlos olivine granular material from Schwenn & Goetze (1978; dashed line) and results of a model calculation using coefficients given in Table 1 (full lines). The particle size is between 0.25 and 0.5 mm in sample S7 and between 0.5 and 1 mm in sample S15. The pressure and temperature conditions are such that sintering proceeds via power-law creep.