Rates of linear crystal growth have been measured for diopside and anorthite growing from their own melts by using a microscope heating stage. Rates were obtained for undercoolings of as little as 13 ¿C. The rates are higher for diopside than for anorthite. Maximum growth rates observed ar 1.5¿10-2 cm/s(ΔT=194 ¿C) for anorthite and 2.2¿10-2 cm/s(ΔT=105 ¿C) for diopside. For diopside this probably does not represent the maximum rate. Both phases grow with a faceted morphology. Plots of Y&eegr;/ΔT versus ΔT indicate that anorphite grows by a surface nucleation mechanism, while diopside grows by a screw dislocation mechanism. These plots can also be used to calculate growth rates at undercoolings less than those at which data have been obtained.