Perhaps I am missing the point, but it seems that this information would be better derived experimentally that by calculation. A good set of sieves and some timed, controlled crystallization would determing this stuff with good accuracy.
Your question os too generic, and o Hope these information may help you
There are several característics of a cristal like size, crystallinity, shape etc. Sodium chloride normally is cubic. X Ray can be used to determine crystallinity. Particle size distribution can bê measured by sieving pra by laser diffraction. MEV is useful to identify physical aspects.