The sum of homogeneous, physically distinct portion of matter in heterogeneous system, as the three phases; solid, liquid, or gas. Each phase may exist in different temperatures and pressures.
See Alexandrite Tsarstone collectors guide, Definition of Phase, http://w.alexandrite.net/viewpage.html?id=GG-101-00003 (The sum of homogeneous, physically distinct portion of matter in heterogeneous system, as the three phases; solid, liquid, or gas. Each phase may exist in different temperatures and pressures.) (as of Apr. 09, 2026, 09:24 GMT).