Lewis & Short

gălactītes, ae, m., and gălactītis, ĭdis, f., = γαλακτίτης and γαλακτῖτις, a precious stone of a milk-white color, otherwise unknown, milk-stone, Plin. 37, 10, 59, § 162.
Called also gălaxias, ae, m., = γαλαξίας, id. ib.