Assertion: plutonium | /r/HasAspect | many different metallic phases
Facets:
Source sentences:
text: Casting and then machining plutonium is difficult not only because of its toxicity, but because plutonium has many different metallic phases, also known as allotropes.
text: Casting and then machining plutonium is difficult not only because of its toxicity, but also because plutonium has many different metallic phases.