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Reference.org
Polyamorphism
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<p>Polyamorphism is the ability of a substance to exist in several different <a href="/facts/Amorphous/YTIzmrR0">amorphous</a> modifications. It is analogous to the <a href="/facts/Polymorphism_(materials_science)/bu2tqsB9">polymorphism</a> of <a href="/facts/Crystal/e2R2mk3E">crystalline</a> materials. Many amorphous substances can exist with different amorphous characteristics (e.g. polymers). However, polyamorphism requires <i>two distinct</i> amorphous states with a clear, discontinuous (first-order) <a href="/facts/Phase_transition/eLP2BY8R">phase transition</a> between them. When such a transition occurs between two stable liquid states, a polyamorphic transition may also be referred to as a liquid–liquid phase transition. </p>