A previous study of time-dependent crack growth in single-crystal quartz has been expanded to examine the possibility of microfracturing events during stable crack growth, to look for evidence of plastic deformation associated with crack propagation, and to determine the dependence of crack growth on crystallographic orientation. No discernible effect of orientation on the temperature or change in applied stress or partial pressure of water dependencies during sequential crack growth episodes was observed, and no correlation was found between observed microfracturing events and the rate of crack propagation. However, the magnitude of the applied stress to achieve the desired rates of crack extension did vary with orientation. No evidence of plastic deformation has been found in samples of quartz undergoing time-dependent crack growth at temperatures up to 250¿C. Some Dauphin¿ twins have been observed at temperatures above 125¿C. The fact that the stress, temperature, and water dependencies are independent of orientation is interpreted to suggest that the observed time-dependent cracking is controlled by the transport of water to the crack tip.