High-level waste feed composition affects the overall melting rate by influencing the chemical, thermophysical, and morphological properties of a cold cap layer that floats on the molten glass where most feed-to-glass reactions occur. Data from X-ray computed tomography imaging of melting pellets comprised of a simulated high-aluminum feed reveal the morphology of bubbles, known as the primary foam, for various feed compositions at temperatures between 600 degrees C and 1040 degrees C. These feeds were formulated to make glasses with viscosities ranging from 0.5 to 9.5Pas at 1150 degrees C, which was accomplished by changing the SiO2/(B2O3+Na2O+Li2O) ratio in the final glass. Pellet dimensions and profile area, average and maximum bubble areas, bubble diameter, and void fraction were evaluated. The feed viscosity strongly affects the onset of the primary foaming and the foam collapse temperature. Despite the decreasing amount of gas-evolving components (Li2CO3, H3BO3, and Na2CO3), as the feed viscosity increases, the measured foam expansion rate does not decrease. This suggests that the primary foaming is not only affected by changes in the primary melt viscosity but also by the compositional reaction kinetic effects. The temperature-dependent foam morphological data will be used to inform cold cap model development for a high-level radioactive waste glass melter.