Correct spelling for the English word "galactile" is [ɡˈalɐktˌa͡ɪl], [ɡˈalɐktˌaɪl], [ɡ_ˈa_l_ɐ_k_t_ˌaɪ_l] (IPA phonetic alphabet).
A mineral, so called from its giving the colour of milk when triturated among water.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.