Assertion: protactinium | /r/HasAspect | bright metallic lustre
Facets:
Source sentences:
text: Protactinium has a bright metallic lustre which it retains for some time in air.
text: Protactinium has a bright metallic luster which is retained for a while in air.
text: Protactinium has a bright metallic lustre which it retains for some time in air.
text: Protactinium has bright metallic lustre and tarnishes slowly in air.
text: Protactinium has a bright metallic luster which it retains for some time in air.